Troubleshooting
20
3A1937C
No heat.
Tripped circuit breaker.
Visually check circuit
breaker for a tripped condi-
tion.
Determine cause of tripped
circuit breaker. Then repair
fault and reset main circuit
breaker.
Low power.
Measure voltage across cir-
cuit breakers. Voltage
should measure between
190 and 275 Vac.
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.
Cable unplugged/loose
wire.
Check for loose or discon-
nected wires and plugs.
Attach plug/wire.
Circuit breaker tripped.
Visually check circuit
breaker for a tripped condi-
tion.
Determine fault that caused
circuit breaker to trip.
Repair fault, and reset cir-
cuit breaker.
Zone not enabled.
Verify zone is enabled on
Heat Run screen.
Enter Setup screen and
enable correct zone.
Incorrect temperature set
point.
Verify zone has a correct
temperature setting on
Heat Run screen.
Enter Setup and enter cor-
rect temperature.
Bad heater.
Measure resistance of
heater.
1. Unplug suspected
heater zone from
heater module.
2. Follow
3. If resistance is outside
allowable value,
replace heater(s).
Contactor not closing.
Turn on heat for zone A1 or
B1and ensure contactor
closes.
1. Verify that there are no
other error conditions
that would prevent
heater from starting.
2. Replace contactor.
Problem
Cause
Verification
Solution
