Installation
16
Troubleshooting for Controller
Problem
Solution
No Power
Verify power is on
.
Turn power off
. Check continuity of all internal fuses in control
transformer, heating elements or optional fused disconnect
circuits
.
Check all field service circuit breakers or fuses
.
Check system temperature limit control to make sure it has not
activated due to excessive heat exchanger temperature or faulty
sensor
.
Turn power off
. Check for loose or disconnected wires.
Check the incoming service connection. Voltage must match
name plate rated voltage. Labels are located on the upper left of
back plate (Serial Number Label).
Alarms do not occur.
Make sure alarm set points are correct.
Make sure alarm is not latched.
Make sure alarm side settings are correct.
Make sure alarm type settings are correct.
Make sure alarm controller is not in diagnostic mode.
Alarms do not clear.
Check power limit setting.
Check operation mode.
Check alarm output function.
Check temperature setting.
