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Troubleshooting
6 311327E
Troubleshooting
Primary Heating System
Before performing any troubleshooting procedures:
1. Relieve pressure, page 5.
2. Turn OFF red main power disconnect.
3. Allow equipment to cool.
(For complete Electrical Schematic, see page 27)
Problems
Try the recommended solutions in the order given for
each problem to avoid unnecessary repairs. Also,
determine that all circuit breakers, switches, and
controls are properly set and wiring is correct before
assuming there is a problem.
Solutions
1. The Thermostat or Thermal Limit Switch is not
functioning properly.
a. Thermostat Check - The amber pilot light will
only be on when the temperature of the primary
heater is below the temperature setting of the
thermostat. Turn the thermostat up (clockwise)
to check the operation of the heater and then
reset to the desired setting. If this does not
solve the problem, continue to Step b.
b. Thermal Limit Switch. When moving the unit, it
is possible that the thermal limit switch may trip
in transit. If this happens, reset the limit switch
and monitor the operation of the heater to
ensure the switch has not tripped as a result of
a heater malfunction.
To reset the Thermal Limit Switch:
1b. Turn OFF the main switch and primary
heater circuit breaker.
2. Turn OFF and lock out power at the source.
²&
2/54
Thermostat
Housing
Heating Rod
Leads
Thermal Limit
Switch
FIG. 1: Primary Heating System
Problem Solution
No heat, amber pilot light does not
cycle on.
1
Partial heat, amber pilot light on
continuously
2