Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was a diagnostic system check performed? | -- | Go to Step 2 | |
2 | Using the J 39200 Digital Multimeter (DMM) test the blower switch output-low circuit at the blower resistor for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace Blower Resistor. Refer to Blower Motor Resistor Replacement in HVAC. Is repair complete? | -- | System OK | -- |
4 | Using the J 39200 Digital Multimeter (DMM) test the blower switch output-low at the hvac control assembly for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 5 | Go to Step 6 |
5 | Repair open in blower switch output-low circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
6 | Replace the HVAC Control Assembly. Refer to Control Assembly Replacement in Heating, Ventilation and Air Conditioning. Is the repair complete? | -- | System OK | -- |
