Form No. 43539470
Oct 2019 A
–19–
14.1)
MOTOR AND BLOWER ASSEMBLY
The motor (including the capacitor) and blower wheel are not serviceable.
If the blower assembly makes excessive noise the motor bearings have failed and the motor needs replacing.
Replace the motor when 230Vac are supplied but it does not turn.
If the blower assembly makes excessive vibration the impellor may require cleaning. Carefully remove the motor
and blower assembly and clean the impellor with compressed air. If vibration persists the impellor needs
replacing.
14.2)
AIR PROVING (SAIL) SWITCH
The air proving (sail) switch is not serviceable.
When the blower starts operating the air proving (sail) switch paddle is pushed on by the airflow and makes a
contact inside the switch. Check that the sail switch paddle blade is not bent and moves freely up or down in the
switch housing. Remove and straighten carefully if necessary.
Remove wires and place an ohm meter over the switch terminals and check that there is continuity when the
paddle blade is moved up or down manually.
Replace if necessary.
14.3)
IGNITION CONTROL MODULE (DSI)
The ignition module (DSI) is not serviceable.
The ignition module controls the proper sequence of operation of the heater. See Section 11 for operating
sequence. A red diagnostics LED on the module provides information as to why the heater may not be operating.
Direct Spark
Red LED Flashes
Error Condition
Steady ON
Internal Control Failure – replace module
1
Airflow Fault – air proving (sail) switch did not make contact
2
Flame is sensed prior to ignition – verify electrode and wiring, replace module
3
Lockout – turn electric power off for 60 seconds and restart