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Troubleshooting for AC fault code indicating a blower vacuum switch failed closed.
Troubleshooting for AO fault code indicating a blower vacuum switch failed open.
Troubleshooting for BD fault code indicating a bad board or secondary high voltage fault.
Information on BO code related to bypass operation with external controls.
Troubleshooting for CE fault code indicating a communication error between control module and display.
Troubleshooting for EE fault code indicating a defective control module.
Troubleshooting for HF fault code: flame present with gas valve closed or flame sensing fault.
Troubleshooting for HS fault code when maximum return water temperature is exceeded.
Troubleshooting for IF fault code indicating ignition failure or insufficient fuel.
Troubleshooting for IO fault code indicating an ignitor failure.
Troubleshooting for LO fault code indicating a switch open within the safety limit string.
Troubleshooting for SB fault code indicating a keypad failure.
Troubleshooting for SF fault code indicating a temperature sensor input failure.
Diagnostic steps for when the heater will not power up without a fault code.
Diagnostic steps for a low voltage circuit fault when no code is displayed.
Troubleshooting for open fuses FC2 or FC1 when no fault code is present.
Troubleshooting for open fuses FC3 or FC1 when no fault code is present.
Troubleshooting for open fuse FC4 when no fault code is present.
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