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Troubleshooting
Troubleshooting
Before performing any troubleshooting procedure:
1. Perform Pressure Relief Procedure found in vpm
Instructions manuals.
2. Turn main power OFF.
3. Allow equipment to cool.
Try the recommended solutions in the order given for
each problem, to avoid unnecessary repairs. Also,
determine that all circuit breakers, switches, and con-
trols are properly set and wiring is correct before assum-
ing there is a problem.
Common Problems
Problem
Heating is slow.
Heating over shoots.
18
Cause
Heater defective.
Low power.
Shorted module.
Verification
Measure resistance of
heater.
Measure voltage across cir-
cuit breakers. Voltage
should measure between
190 and 275 Vac.
Verify for given zone that
temperature does not
increase when zone is dis-
abled.
Solution
Follow Heater Resistance
Checks, page 14.
1. If voltage is lower than
expected, use electrical
schematic to locate
faulty wiring or connec-
tion.
2. Have a qualified electri-
cian service electrical
components.
Verify RTD wire or heater
power cord is attached to
correct heat module.
Replace module.
3A1937C
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