Brivis fault code h01 46
No flame on ignition attempt.
What h01 46 actually means
The heater tried to light and no flame was detected. It will normally have another go or two before locking out properly, so this is often the code you see before h01 50.
What causes it
- Gas supply off at the appliance isolation valve, or turned off at the meter and not turned back on
- LPG bottle empty, or the changeover valve still pointing at the empty one
- Dirty or worn igniter, which is the most common genuine fault
- Flame sense rod dirty or corroded, so the flame lights but the heater cannot see it
- Gas pressure too low at the appliance, often on a line that also feeds a cooktop and a hot water unit
Most likely first. That order is from what we actually find on site, not from the manual.
Safe to check yourself
No tools, no covers off, nothing to do with gas, refrigerant or wiring.
- Check the gas isolation valve at the heater, the handle should sit in line with the pipe
- Check another gas appliance in the house lights, which tells you whether it is the heater or the supply
- If you are on LPG, check the bottle and the changeover valve
- Turn the controller off and back on once, and let it complete a full ignition attempt
- If it locks out again, stop there and book it
What we check on site
So you know what you’re paying for.
- Gas pressure test at the appliance, standing and working
- Igniter and flame sense rod inspection, clean or replace
- Flame current measurement in microamps against spec
- Gas line sizing check where several appliances share a run
- Combustion analysis once it lights
Can you keep using it?
There is nothing running to keep going. Resetting it a few times is fine, but do not sit there cycling it all evening; every failed attempt puts unburnt gas into the combustion chamber before the purge clears it.
What the fix usually involves
A good proportion of these are a valve someone turned off or an empty bottle, and cost you a phone call. The genuine ones are usually an igniter or a flame sense rod, both stocked and both done on the first visit.
Is it worth fixing?
That depends almost entirely on how old the unit is. Past about ten years on hot water and gas heating, and twelve on aircon, a significant repair usually costs more per remaining year than a replacement does — and it’s the same point at which the VEU rebate is worth the most, because old inefficient appliances are exactly what the scheme pays to remove. If yours is young and the fault is a component, we’ll fix it and say so.
Repair or replace? The 10-year rule, and what the rebate is worth →