HIGHError Code
A2: Flue Gas Temperature Too High (Boiler)Emergency Diagnosis & Repair
Boiler flue gas temperature exceeded maximum safe limit.
What This Error Code Means
Exhaust temperature sensor detected overheating in flue system.
Common Causes
Blocked heat exchanger
Insufficient water flow
Circulator pump failure
Burner overfiring
Incorrect combustion settings
Affected Brands
ViessmannNavienWeil-McLainBuderusLochinvar
How ROMA Heating Fixes This Error Code
Check heat exchanger for blockages
Verify water flow
Measure gas pressure
Clean or replace heat exchanger
Reset and monitor temperature
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