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Bonaire Gas Heater Fault Codes

As the temperature drops in Melbourne, having a reliable and efficient heating system becomes necessary. The MB series of the Bonaire Ducted Gas Heater are popular among homeowners, offering a range of benefits and features that make them an ideal solution for cold winter days. In this article, we will learn more about the Bonaire MB Ducted Gas Heaters, some of their benefits, what are the different MB series and their models, and what are some of the most common error codes of the different MB series, and why these heaters are a great option for Melbourne residents.

Bonaire MB Ducted Gas Heater

The Bonaire MB Ducted Gas Heater series consists of highly efficient heating solutions that are designed to provide fast and consistent heat distribution throughout your home. The following are the different MB series available in the market along with the different models of each series:

  • MB3
    • MB314
    • MB320
    • MB325
    • MB330
  • MB4
    • MB414
    • MB420
    • MB425
    • MB430
    • MB435
  • MB5
    • MB515
    • MB521
    • MB530
    • MB535
  • MB6
    • MB621
    • MB630
    • MB635

With their compact design and quiet operation, these heaters are perfect for Melbourne homes of all sizes. MB3 series has an Energy Star rating of 3 stars, MB4 series heaters have a 4-star rating, MB 5 ducted gas heaters come with 5 stars, and the MB6 series has a 6-star rating. The greater the Energy Star rating, the higher energy efficiency and eco-friendliness.

Benefits

The following are some of the benefits that the different MB series of Bonaire ducted gas heaters can offer you:

1) Fast and Efficient Heating:

The MB series of ducted gas heaters provide rapid and consistent heat distribution throughout your home, ensuring you stay warm and cozy during the cold winter months.

2) Cost-Effective:

The MB series are designed to maximize heating efficiency, ensuring that every ounce of energy is utilized effectively to keep your space warm and comfortable, saving you money on your energy bills.

3) Quiet Operation:

The MB heaters operate quietly and efficiently, allowing you to enjoy peaceful surroundings while staying comfortably warm.

4) Flexible Installation:

The compact design of these series allows for flexible installation options, including ceiling or underfloor mounting.

5) Environmentally Friendly:

The MB series’s energy efficiency rating makes them an eco-friendly choice for Melbourne homeowners.

6) Reliable and Durable:

The MB series are built to last, with a robust design and high-quality components ensuring reliable performance for years to come.

MB Ducted Gas Heater Error Codes

While the Bonaire MB series is engineered for reliability, like any heating system, the Bonaire MB Ducted Gas Heaters may occasionally display error codes. Here are some common error codes and their solutions:

MB3 Ducted Gas Heater Fault Codes

Green LED

Condition

Brief Diagnosis

Normal Operation Mode

Slow Single

Idle state waiting for a call for heat

functioning normally, and is in an idle state

Slow Double

Normal Operation in thermo

closed state

functioning normally, with the thermostat closed.

Fault Mode

1

Overheat condition

Overheat in progress

2

Pressure switch inactive

Fan Running but Pressure switch is still open.

Fan stopped but pressure switch is still closed.

3

Purge/ Inter-wait

Timer Operating.

Thermostat off during Flame Establishment time.

Flame establishment time elapsed without flame

4

Pressure switch lockout.

(Pressure switch not functional)

Fail to close timeout / Fail to open timeout.

5

Ignition lockout

(Failure to ignite flame.)

Maximum number of re-ignition / spark

restoration attempts have been reached.

6

Gas Valve fault lockout.

(Valve Detection failure).

Valve is disconnected

Gas valve drive relay contacts fail to close

Gas valve drive triac fault: short, open or halfwave.

7

Over temp lockout

(High limit)

Too many Hi-Limit activation’s in latest heat

cycles

Hi Limit activation continues longer than Hi

Limit Fan +Cool Down times.

8

Frequency Lockout.

(Timing Fault)

Supply frequency outside operating limits.

Microprocessor clock outside operating limits

9

Flame lockout.

(Invalid flame A/D Value)

Flame sense hardware fault

10

Safe Start lockout

(False flame)

Invalid Flame sensed during Safe start check

or IDLE -hardware fault.

11

Safe Start lockout

(Secondary safeguard timing fault)

Main valve Safeguard too slow or failed to

activate –

hardware fault.

12

Safe Start lockout

(Secondary safeguard timing fault)

Safe Start checks did not complete in time, no

hardware fault recorded.

MB4 & MB5 Ducted Gas Heater Fault Codes

LED Code

Brief Diagnosis

Normal Operation

4 x SHORT: for

HCCLI01-4S

5 x SHORT: for

HCCLI01-5S

Normal Idle – Unit is functioning normally

    • with the thermostat (manual or digital) open, or is in overheat cooldown

1 x SHORT

Normal Heating – Unit is functioning normally, with the thermostat (manual or digital) closed

Faults

2 x SHORT

Overheat prevention cool down – duct temperature reached the

‘HeatAutoOffTemperature’ and the heater is now in auto cool down state

3 x SHORT

Overheat condition – Overheat in progress

Overheat switch is disconnected or open circuit, or

Thermistor reports temperature higher than +85C

ThermistorOverTemperature

6 x SHORT

Primary Pressure Switch Fault 1 – closed in Gas idle state

7 x SHORT

Secondary Pressure Switch Fault 1 – closed in Gas idle state

8 x SHORT

Primary Pressure Switch Fault 2 – open during pre purge

9 x SHORT

Primary Pressure Switch Fault 3 – closed after post purge was completed

10 x SHORT

Secondary Pressure Switch Fault 2 – closed after post purge was completed

11 x SHORT

Forced Purge – Unit was forced to purge state by an incorrect sequence of

events

12 x SHORT

Manual thermostat – closed on power up and still has not open

13 x SHORT

Condensation sensor activated or S/C

    • Condensation sensor has detected moisture above allowed CondensateThrWet level or sensor is S/C (both situations produce very similar readings from the sensor)

14 x SHORT

Condensation sensor fault

    • Condensation sensor is deemed to be faulty as the readings from the sensor are indicating O/C

15 x SHORT

Frequency check fault

Most likely due to blown240v fuse or internal control board fault

16 x SHORT

–spare–

MB4 & MB5 Ducted Gas Heater Fault Codes Continued

Error#

Lockouts

17

1 x LONG

Thermistor Dynamics Lockout – the thermistor temperature

failed to rise by ThermistorTempRise within

ThermistorFaultTime of the start of a heat cycle

18

1 x LONG + 1 x SHORT

Thermistor O/C Lockout – thermistor open circuit or reporting

temperature below – 20C

19

1 x LONG + 2 x SHORT

Thermistor S/C Lockout – Thermistor short circuit or

reporting temperature above 120C

20

1 x LONG + 3 x SHORT

Overheat Lockout – one or more of the following conditions exist for longer than FanOverheatTime + FanCoolDownTime times:

Overheat switch activation or

Thermistor signal too high

21

1 x LONG + 4 x SHORT

Overheat Lockout – number of Overheat events caused by:

Overheat switch activation or thermistor signal too high in the last 10 heat cycles exceeded

HiLimmitLockCount

22

1 x LONG + 5 x SHORT

Frequency Lockout – Timing fault Supply frequency outside of operating limits Microprocessor clock outside of operating limits

23

1 x LONG + 6 x SHORT

Primary Pressure Switch Lockout 1 – closed for too long in

Gas idle

24

1 x LONG + 7 x

SHORT

Secondary Pressure Switch Lockout 1closed for too long

in Gas idle

25

1 x LONG + 8 x SHORT

Primary Pressure Switch Lockout 2 – did not close for too

long in Gas pre purge

26

1 x LONG + 9 x SHORT

Primary Pressure Switch Lockout 3 – did not open for too

long after Gas post purge was completed

27

1 x LONG + 10 x SHORT

Secondary Pressure Switch Lockout 2 – did not open for too long after Gas post purge was completed

28

1 x LONG + 10 x SHORT

— spare —

29

2 x LONG

Flame Strength Lockout – invalid Flame A/D value

Flame sense hardware fault (flame strength readings too low)

30                    

2 x LONG + 1 x SHORT

Ignition Lockout – failure to ignite flame Max number of re-ignition / spark restoration attempts has been reached. Weak spark

31

2 x LONG + 2 x SHORT

Ignition Lockout – failure to maintain stable flame during ignition

Max number of unstable flame occurrences during ignition has been reached.

32

2 x LONG + 3 x SHORT

Ignition Lockout – failure to maintain stable flame during heating

Max number of lost flame during heating has been reached

33

2 x LONG + 4 x SHORT

Modulation Valve Operation Lockout – Valve Detection

failure

Valve is disconnected (O/C) or

Coil current readings are too low (coil resistance 77 Ohms)

Connections must be on Mod Valve NOT Mod valve option

34

2 x LONG + 5 x SHORT

Modulation Valve Safety Lockout – Valve Connection failure

Valve is S/C or

Coil current readings are too high

35

2 x LONG + 6 x SHORT

P/S 170pa Red + Grey

P/S 130pa Ora + Grey

Main Valve Lockout – Valve Detection failure Valve is disconnected (O/C) or flue is blocked disconnect flue and try again. Flue restrictive disconnect and test Gas valve drive relay contacts failed to close or Gas valve drive triac fault: short, open or half-wave

36

2 x LONG + 7 x SHORT

— spare —

37

2 x LONG + 8 x SHORT

— spare —

38

3 x LONG

Ground Fault Lockout 1 – False Flame due to poor earth

connection to chassis ground:

False flame detected upon Power up / Reset and /or

False flame disappeared after Overheat condition cleared

39

3 x LONG + 1 x SHORT

Ground Fault Lockout 2 – Flame variation detected due to poor earth connection to chassis ground during Earth Connection quality check (when there shall be no flame signal at all)

40

3 x LONG + 2 x SHORT

SafeStart lockout 1a – False Flame sensed for more than 10 sec during Idle state

41

3 x LONG + 3 x SHORT

SafeStart Lockout 1b – False Flame (that was sensed in Idle state) cleared itself any time after circ fan turned off

42

3 x LONG + 4 x SHORT

SafeStart Lockout 2a – Main Secondary Safequard Timing activated too early during SSG test (hardware fault)

43

3 x LONG + 5 x SHORT

SafeStart Lockout 2b – Main Secondary Safeguard Timing

fault (hardware fault)

Not activated or

Activated too late during SSG test

44

3 x LONG + 6 x SHORT

SafeStart Lockout 3 – Main Secondary Safeguard Timing

fault (might be hardware fault, might be not)

Not deactivated or

Deactivated too late during SSG test

45

3 x LONG + 7 x SHORT

SafeStart Lockout 4 – Main Secondary Safeguard check failed for unknown reason

MB5 NC & MB6 Fault Codes

Fault

Code

Result

Notes

None

0

No action

Overheat prevention

2

Restart

Outlet temperature too high, heater
off to prevent overheat occurring. Ensure the thermistor is located correctly according to
installation instructions.

Overheat detect (thermistor or
switch)

3

Restart

Temporary parameter storage
fault

4

Restart

Transient parameter storage fault.
Replace the control board

if the issue persists

Pressure lost

6

Restart

Pressure lost following initial
check of combustion fan operation. Check the silicone hose connections
and fittings. The silicone hose must not have any holes or cuts.

Comb fan drive too high

7

Restart

Combustion fan output too high for
pressure level detected.
Possible flue
blockage. Check the flue pipe and connections.

Flame not detected

8

Restart

Flame not detected during ignition.
Check gas supply, spark and flame sensor

Flame unstable

9

Restart

Flame out immediately after
ignition. Check gas flow and flame sensor location.

Flame lost during heating

10

Restart

Flame loss after stable flame
achieved. Check gas supply.

Shutdown due to transient
problem

11

Restart

Most likely due to stat off –
transient condition only.

Stat on at power up

12

Restart

Call for heat detected at power up.
W input asserted at power up or following reset.

Persistent Condensate Sense

13

Shutdown and fault

Not applicable. (functionality
reserved for MB6 products)

Condensate sensor fault

14

Shutdown and lockout

Short circuit or open circuit
condensate sensor. Not applicable. Functionality reserved for 6 Star products)

System timing error

15

Shutdown and lockout

Mains frequency not 50Hz or internal
control fault. Check the mains supply. Replace the control board if problem persists.

Mod Valve over Current

16

Restart

Current in the mod valve too high
for current setting. Check the valve circuit and connections. Replace the valve if
required
.

Thermistor location fault

17

Shutdown and lockout

Ensure the thermistor is located
correctly inside the ducting. Refer to installation instructions for more
information.

Thermistor open circuit

18

Shutdown and lockout

Check the thermistor connection.
Replace the thermistor if required.

Thermistor short circuit

19

Shutdown and lockout

Check the thermistor connection.
Replace the thermistor if required.

Overheat switch or thermistor
fault

20

Shutdown and lockout

Thermistor or overheat switch still
indicating overheat after cooldown time has expired. Check thermistor connection. Check the
Overtemp sensor connection. Check to ensure the room fan is operating

Too many overheats (switch)

21

Shutdown and lockout

Appliance is constantly overheating.
Overtemp sensor trips at 90C. Check the thermistor is located correctly according to
installation instructions. Check room air fan operation. Check ducting for blockages. Check
the gas valve test point pressure.

Too many comb fan drive
errors

22

Shutdown and lockout

Possible partial blockage or high
resistance in the flue piping. Check the flue pipe and connections to ensure there is no
blockage.

Pressure detected in idle
state

23

Shutdown and lockout

Pressure sensor fault or combustion
fan still running when supposed to be off. Check combustion fan operation. If combustion fan
is not the cause of the issue the control board needs to be replaced.

Pressure not detected

25

Shutdown and lockout

No pressure detected during initial
combustion fan test. Check combustion fan, pressure sense tubes
connected and in correct orientation (fitting on the combustion fan box must be
attached to the Negative side of the pressure sensor.

Too many pressure losses

26

Shutdown and lockout

Ensure the silicone hose is attached
properly and the fittings are intact.

Low 24Vac

27

Restart

Too many overheats
(thermistor)

28

Shutdown and lockout

Ensure the thermistor is located
correctly according to installation instructions. Check the room fan to ensure the
operation. Check the gas test point pressure.

Flame sense fault

29

Shutdown and lockout

Check earth connect

Too many ignition attempts

30

Shutdown and lockout

Check the gas supply. Might also
happen if the appliance has not been used for a prolonged period of time when the gas line
needs to be purged of air.

Too many validation attempts

31

Shutdown and lockout

No 24Vac

32

Shutdown and lockout

Check 24V fuse and
transformer.

Mod valve open circuit

33

Shutdown and lockout

Check the valve connection
terminals. Replace the loom if connection faulty. Replace the valve and control board if the
problem persists
.

Mod valve short circuit

34

Shutdown and lockout

Check the valve connection
terminals. Replace the loom if connection faulty. Replace the valve and control board if the
problem persists.

Circulation fan drive fault

35

Shutdown and fault

Fault with circulation fan or fan
wiring fault. Check the fan wiring and room fan.

Combustion fan drive fault

36

Shutdown and fault

Fault with combustion fan or fan
wiring fault. Check the fan wiring and combustion fan.

AC input fault

37

Shutdown and fault

Transient internal control
fault

System error – A/D converter

38                   

Shutdown and lockout

Internal control fault. Replace the control board if the problem
persists.

System error – MCU fault

39

Shutdown and lockout

Internal control fault. Replace the
control board if the problem persists.

False flame

40

Shutdown and lockout

Flame detected with no gas. Check
earth connection and leaking gas valve.

Primary valve not on

41

Shutdown and lockout

No 24Vac to gas valve. Check wiring.
Replace the loom if required
.

Primary valve stuck on

42

Shutdown and lockout

Primary relay detected as on. Check
gas valve wiring. Replace wiring/loom or gas valve if required.

Primary valve lost

43

Shutdown and lockout

Gas valve dropped out during
running. Check valve and wiring. Replace valve wiring/loom and gas valve if required.

Secondary valve not on

44

Shutdown and lockout

Gas valve did not pull in. Check
valve and wiring. Replace if required.

Secondary
valve stuck on

45

Shutdown and lockout

Secondary relay detected as on.
Check gas valve wiring. Replace wiring/loom or gas valve if required.

Secondary
valve lost

46

Shutdown and lockout

Gas valve dropped out during
running. Check valve and wiring. Replace wiring/loom or gas valve if required.

MCU
communications error

48

Restart

Transient internal control
fault.

MCU communications fault

49

Shutdown and lockout

Internal control fault. Replace the
control board if the problem persists.

Remote MCU not shut down

50

Shutdown and fault

Transient internal control
fault.

Incorrect remote MCU state

51

Shutdown and fault

Transient internal control
fault.

Mismatch in MCU information

52

Shutdown and fault

Transient internal control
fault.

Mismatch in MCU sequence

53

Shutdown and fault

Transient internal control
fault.

Remote MCU lockout

54

Shutdown and lockout

Internal control fault. Replace the
control board if the problem persists.

Unidentified fault

55

Shutdown and fault

Transient internal control
fault.

Pressure sensor fault

56

Shutdown and lockout

Internal control fault. Control
board to be replaced if the problem persists.

Invalid model

57

Shutdown and lockout

Model dongle not connected or
missing a screw. Check the model selection dongle to ensure all three screws are in place
and the wiring is connected to the terminal the right way around.

Maximum number of reset
exceeded

58

Shutdown and lockout

Too many faults detected with 15
minutes. Wait 30 minutes and re-try

Expert Assistance

If you have tried troubleshooting on your own but the issue persists with your ducted gas heater from the MB series or are looking to book a service call, contact DGB Refrigeration Heating & Cooling at 03 7038 6918 for expert assistance. Our team of professionals is dedicated to ensuring your heating system runs smoothly and efficiently. Regular maintenance can help prevent error codes and ensure optimal performance.

Tips for Optimal Performance

The following are some of the tips from our expert technicians to ensure optimal performance of your ducted gas heater:

  • Regularly clean and inspect the unit to ensure proper airflow and combustion.
  • Ensure proper installation and configuration for optimal performance.
  • Use zoning capabilities to heat only the areas of your home that need it.
  • Consider upgrading to a smart thermostat for enhanced control and efficiency.

Conclusion

The MB series from Bonaire are reliable and efficient heating solutions for Melbourne homes. With fast and consistent heat distribution, cost-effective design, quiet operation, and environmentally friendly features, these series are ideal choices for homeowners looking for a high-quality heating system. Remember, if you encounter any error codes or require maintenance, contact DGB Refrigeration Heating & Cooling by dialing 03 7038 6918 for expert assistance.

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