Intellitec ELECTRONIC CLIMATE CONTROL II Service Manual page 9

ELECTRONIC CLIMATE CONTROL II
SERVICE MANUAL Part No's. 00-00855-000 / 00-00856-000
Symptom
No green "ON" indicator, Thermostat in any functional
position
Red "Shed" indicator always ON
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Possible Cause / Remedy
Reset circuit breakers in Main distribution box.
Diagnostic "IPX OK" LED on the control module is NOT on:
If "IPX FAULT" LED is NOT on,
1) Check the 5A fuse in the distribution panel for
control module power.
2) Check for +12VDC at pin 2 of J1 on control
module and ground at pin 4. Make sure that
the power connector (PC1A) is plugged into J1
on the control module.
pigtail keying matches connector keying.
3) Check voltage at the line sensor input (J7). It
should be greater than 11 volts.
4) Measure the DC voltage between the Power
(J1-4), IPX SIG (J1-8) and IPX GND (J1-7) pins
on the control module.
approximately 12 volts from IPX GND to Power
and 9 volts from IPX GND to IPX SIG. The
same voltages
Thermostat. If not, repair wiring.
5) Replace control module.
If the "IPX FAULT" LED is ON: - This indicates a short
in the wiring between the control module and the
thermostat. Check the wiring for the short and repair.
1) Appliances drawing too much current to allow
air conditioners to operate.
2) Current sensor not connected or open. Repair
or replace.
3) Another device in the IPX system is
programmed for Module P and is currently
active.
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Make sure that the
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should appear
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P/N 53-00855-856 Rev. C 080819
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