E.“No Heat” Drive and Blower Motors Run (Gas Models)...
1.Check for voltage across L1 and GND of the HSI module.
If no voltage is present, then check for voltage from terminal #14 on the blower contactor to ground. If no voltage is present, the problem is with blower contactor.
If voltage is present, the problem is faulty wire or termination between blower contactor and HSI module.
2.If voltage is present, check for voltage across terminal “W” and “GND” of the HSI module. If voltage is present, the problem is faulty HSI module.
If no voltage is present, then check voltage at J10 6 pin connector on the Phase 6 computer.
If voltage is present, the problem is faulty wire or terminal between HSI module and Phase 6 computer.
If voltage is not present, then there is a possible problem in the safety circuits (if this is the case the computer should be displaying an error code). If this is not the case than the Phase 6 computer is faulty.
F.“No Heat” Drive and Blower Motors Run (Steam Models)...
1.Check for voltage across pin #3 and #4 of the J13 6 pin connector. If voltage is present, the problem is faulty steam damper solenoid.
If no voltage is present, check for voltage across pin 3 and 4 of the J12 9 pin connector.
If voltage is present, the problem is faulty wire or termination between J12 connector and J13 connector. If no voltage is present, check for voltage across pin 1 and 2 of the J6 4 pin connector.
If voltage is present, the problem is faulty wire or terminal between the J6 4 pin connector and J12 9 pin connector.
If no voltage is present, check for voltage between pin 5 of the J10 connector and ground. If voltage is present, the problem is faulty wire or terminal between J1 and J6 connector. If no voltage is present, check for voltage across pin 4 of the J10 connector and ground. If voltage is present, the problem is faulty computer board.
If no voltage is present, check for voltage between pin 1 of the J10 connector and ground.
If voltage is present, the problem is fault wire or termination between pin 1 and 4 of the J10 connector. If no voltage is present, the problem is faulty computer.
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