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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Rinnai Error Code 07 - Heat Exchanger High Temperature Fix
Rinnai code 07 means secondary heat-exchanger overtemperature. Check flow, inlet screen, scale, airflow restriction, thermistor, and gas pressure.
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Rinnai Error Code 10 Exhaust Blockage
Rinnai code 10 guide for exhaust blockage, condensate restrictions, fan motor checks, vent safety, and when tankless service is needed.
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Rinnai Error Code 29 — System Communication Fault Fix
Rinnai code 29 guide for tankless water-heater system faults, PCB checks, sensor wiring, remote controls, communication, and resets.
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Coleman Furnace 4 Flashes High-Limit Fault
Coleman furnace 4 flashes means the high-limit switch opened. Check airflow, filters, blower speed, return ducts, gas input, and limit switch wiring.