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tabitha64Nov 16, 2025
How to troubleshoot a Cumberland C80M Heater that won't turn on?
- KKatelyn McdonaldNov 16, 2025
If your Cumberland Heater unit isn't operating and the LED isn't lit, here's what to check: * **No Power:** Ensure the heater is getting power by checking and repairing the electrical supply. * **Thermostat:** The thermostat might be open or malfunctioning. Try resetting or replacing it. * **Toggle Switch:** Make sure the toggle switch is in the “ON” position or replace it if it's faulty. * **24 Volt Transformer:** Check the 24-volt power output of the transformer across terminals #3 and #4 of the terminal block. If there's no output voltage, replace the transformer. * **Flame Safeguard Relay Module (FSR):** Check for 24-volt power input to terminal #9 on the FSR. If there's no power, replace the red wire going to terminal #4 of TB1. If power is present at terminal #9, replace t...
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