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58SU0A (Series 2 & 3): Troubleshooting Guide
42 INDUCER MOTOR FAULT the RPM pulses are not detected from the inducer motor within 20 seconds after a heat request
the inducer is outside of its valid range of operation, or the inducer RPM signal was lost for 5 seconds during operation.
Check for:
- Proper vent sizing
- Restricted combustion air supply
- Failed inducer motor
- Improper or loose motor wiring or bad connection
45 CONTROL CIRCUITARY LOCKOUT Auto-reset after one hour lockout due to:
- Gas valve relay stuck open
- Flame sense circuit failure
- Software check error
Reset power to clear lockout. Replace control if status code repeats.
COMPONENT TEST
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R" thermostat lead. Briefly short the TEST/TWIN terminal
to the "C" terminal. Status LED will flash most recent code 4 times and then turn ON the inducer motor.
The inducer motor will run for the entire component test. The hot surface igniter, blower motor fan speed, blower motor-heat speed, and blower
motor-cool speed will be turned ON for 10-15 seconds each. Gas Valve and Humidifier will not be turned on.
LED CODES
STATUS
11
Indicated the blower motor tested OK. Visual check of inducer motor and hot surface igniter required.
25
SETUP ERROR - Reference code 25 on left
42
INDUCER MOTOR FAULT - Indicates inducer motor failed test. Check inducer, wiring, furnace control and tubing
for poor connections
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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