4
TROUBLESHOOTING
WARNING
FIRE, EXPLOSION OR SHOCK HAZARD.
MAY CAUSE PROPERTY DAMAGE, SEVERE IN-
JURY OR DEATH.
Do not attempt to modify the physical or electrical
characteristics of this device in any way. Replace
it if troubleshooting indicates a malfunction.
The integrated furnace control has two status lights:
• PWR—is on whenever the control has 24 Vac input
power from the system transformer.
• OK—comes on if control’s internal checks are OK.
Light pulses at approximately six second intervals as
long as control’s continuous self-check indicates
normal operation. If the light goes out during opera-
tion, control must be replaced.
IMPORTANT
1. The service procedure outlined in Fig. 3 is a general
guide. Follow appliance manufacturer’s service in-
structions if available.
2. All meter readings must be taken within the trial for
ignition period. Once the ignition period ends, the
system must be reset by setting the thermostat
down for at least 45 sec. before continuing.
3. If any component does not function properly, make
sure it is correctly installed and wired before replac-
ing it.
4. Static discharge can damage the integrated furnace
control. Touch metal surface to discharge static
electricity before touching furnace control.
5. The integrated furnace control cannot be repaired.
If it malfunctions, it must be replaced.
6. Only trained, experienced service technicians should
service integrated furnace control systems. Per-
form the checkout steps on page 3 before beginning
the troubleshooting procedure in Fig. 3. Following
troubleshooting, check out the system again to be
sure it is operating normally.
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