Brivis fault code h01 43
Overheat cool-down in progress.
What h01 43 actually means
The heater is cooling itself down after an overheat and will come back on by itself. This one is informational rather than a fault, but it is a symptom of the same airflow problem behind h01 40 and h01 41.
What causes it
- Whatever caused the overheat in the first place, usually a blocked filter or closed vents
- Normal behaviour immediately after an overheat trip
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.
- Wait five minutes and let it finish
- Then check the return-air filter and open all the ceiling vents
- If it goes into cool-down repeatedly, treat it as h01 40
What we check on site
So you know what you’re paying for.
- Same as h01 40: airflow, filter, ductwork, fan speed and the overheat circuit
Can you keep using it?
Yes, this one is fine. The heater is protecting itself and will restart. What is not fine is seeing it often, because that means the heater is overheating often.
What the fix usually involves
Fix the airflow and this code stops appearing. It is a symptom rather than a fault.
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 →