Reznor UDAS Unit Installation Manual User Manual
Page 37
Page 37
No heat (Heater Op-
erating)
1. Incorrect valve outlet pressure or orifice.
1. Check valve outlet pressure. See Rating plate for manifold pressure.
2. Cycling on limit control.
2. Check air throughput.
3. Improper thermostat location or adjustment.
3. See thermostat manufacturer's instructions.
Fan or venter motor
will not run
1. Circuit open.
1. Check wiring and connections.
2. Defective integrated circuit board.
2. Replace board.
3. Defective motor or starter.
3. Replace motor or starter.
Fan or venter motor
turns on and off while
burner is operating
1. Motor overload device cycling on and off.
1. Check motor load against motor rating plate. Replace motor if needed.
Fan or venter motor
cuts out on overload
1. Low or high voltage supply.
1. Correct electric supply.
2. Defective motor.
2. Replace motor.
3. Poor airflow.
3. Clean motor, fan, fan guard, filter, and coils