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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 1 – closed 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.