The Baxi H.03.02 code means “Temporary flame loss.” The boiler control detected that a flame which had been established was no longer present for a time.
“Temporary” describes the status reported by the boiler; it does not mean the message should be ignored. The code does not identify a failed component, and it is not evidence that a homeowner should adjust the gas supply, ignition system or flue.
Which Baxi boilers show H.03.02?
Baxi’s current error-code table lists H.03.02 for the Baxi 200, 400, 600 and 800 Combi 2; Baxi Assure 500 Combi 2; Baxi 600 and 800 System 2; and Baxi Assure 500 System 2.
Confirm the complete model name from the boiler front or your documents. Do not remove the casing. The exact model matters because displays, user controls and reset instructions vary.
What is temporary flame loss?
During normal operation, the boiler’s controls monitor whether the burner flame is present when required. H.03.02 indicates that this flame signal was lost temporarily.
There are several professional checks that may be relevant, but the public code description does not choose between them. Do not assume the burner, electrode, gas valve, wiring or circuit board needs replacing. A Gas Safe registered engineer must assess gas, ignition, combustion and internal electrical components.
How is H.03.02 different from similar Baxi codes?
- H.03.02 means temporary flame loss.
- H.03.54 means temporary flame loss with shutdown because the power-supply voltage is too low.
- E.01.04 means flame loss was detected five times within 24 hours.
Those distinctions are useful when booking repair. Photograph or write down the complete code rather than reporting only “flame fault”.
What might happen when H.03.02 appears?
The boiler may pause, attempt to manage the condition through its controls or stop providing heating or hot water. Behaviour can vary with the exact model and circumstances. If the display clears, keep a note of it; an intermittent event can still be important if it returns.
Do not listen for internal components or watch through any opening to decide whether ignition is working. Keep the boiler closed and use only normal user controls.
Safe checks you can make
- Record H.03.02 exactly, including the dots.
- Confirm the full boiler model.
- Note whether heating, hot water, or both were affected.
- Write down any code displayed immediately before or afterwards.
- Note whether the event followed a power interruption, service visit or other work.
- Check whether other gas appliances appear unavailable, but do not repeatedly operate them as a test.
- If the property has a prepayment gas meter, check only its normal visible display and follow the supplier’s user instructions.
Do not remove the casing or inspect the burner, electrodes, gas valve, combustion area, flue, wiring or circuit board. Do not test gas pressure, voltage, resistance, continuity or flame current.
Can I reset a Baxi H.03.02 code?
If the exact model’s user guide permits a reset, one reset using the normal control is reasonable. Baxi reset methods vary, so follow the correct guide.
If H.03.02 returns, stop resetting the boiler and arrange repair. Repeated resets do not fix recurring flame loss and may remove useful context about when the problem occurs.
When is it urgent?
If you smell gas, suspect carbon monoxide, feel unwell near the appliance, see scorching, or a carbon-monoxide alarm sounds, leave the property. Avoid switches and naked flames, then follow the Gas Safe Register’s emergency guidance and call the National Gas Emergency Service on 0800 111 999 from a safe place.
Do not use the boiler again until it is safe to do so. Never block a ventilation opening or flue terminal, and do not attempt to clear or dismantle either.
What should you tell the engineer?
Share the exact code, complete model, which services stopped, how often the message appeared and whether any other code was shown. Mention recent work, supply interruptions and any changes elsewhere in the home. A clear display photograph can help if it can be taken without touching or opening the appliance.
For other safe code explanations, visit the boiler help hub.
Is temporary flame loss interrupting your Baxi boiler?
Book a fixed-price boiler repair aimed at fixing the fault, with the booking price clear before the visit.
Quick answers about Baxi H.03.02
What does Baxi H.03.02 mean?
It means the boiler has detected temporary flame loss.
Does “temporary” mean it is safe to ignore?
No. Record the code and arrange repair if it returns or affects heating or hot water.
Is H.03.02 the same as H.03.54?
No. H.03.54 specifically links temporary flame loss and shutdown to low supply voltage.
Can I inspect the burner or electrodes?
No. Keep the boiler closed. Gas, ignition and combustion checks belong to a Gas Safe registered engineer.
Should I keep resetting the boiler?
No. Use one reset only if the exact model guide permits it. If the code returns, arrange repair.