HVAC, Appliance, CNC, and VFD Error Code Repair Guides
Browse repair guides for HVAC, appliances, refrigeration, CNC alarms, VFD faults, generators, boilers, water heaters, and commercial equipment.
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Burnham Boiler E3 Error Code - High-Limit Lockout
Burnham boiler E3 means high-limit lockout. Check water flow, zone valves, circulator pump, system pressure, and high-limit setpoint.
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Carrier 11 Error Code - No Ignition Furnace Lockout
Carrier fault code 11 means no ignition. Check gas supply, hot surface igniter resistance, flame sensor signal, burner condition, and gas valve output.
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Carrier 14 Error Code - Ignition Lockout
Carrier 14 means ignition lockout after repeated failed trials. Check the igniter, flame sensor, gas supply, inducer, pressure switch, and wiring.
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Carrier 25 Error Code - Flame Sense Fault
Carrier 25 means a false or unexpected flame signal. Check the flame sensor rod, ceramic insulator, gas valve leakage, grounding, and wiring.