Page 80 of 84
Problem
Probable Cause
Solution
No Heat
No call for heat
Check that the controls are set to call
for heating
No power and control voltage to heater
Check that heater has power and
control voltage
Faulty component
Check components with continuity meter,
replace as necessary
Not Enough Heat
Faulty component
Check ampere draw is reasonably close
to that on the heater data plate If more
than 10% short, begin testing individual
components, replace as necessary
Heat anticipator current draw too low,
causing short cycling
Check current draw
Heater Cycling on
Automatic
Limit
Improper airflow
Check for obstructions to return air, loose or
broken fan belt and clogged filters and/or
evaporator coils
Faulty temperature limit switch
Test and, if necessary, replace
Open Secondary
Protective
Device
Stuck contactor
Check contactor
Contactor Chatter
Improper wiring
Check wiring
Insufficient transformer capacity
Check transformer
Element Failure
Corroded hardware and/or loose
connections
Check hardware
Table 13.7: Electric Heater
PR Series Installation, Operation, and Maintenance Manual
