User Guide

Field Service Checklist
21
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Observed Problem: Possible Cause: Remedy:
E.
Continuous high
re (electronics
problem).
1. Short circuit
in TS194(Q)
Discharge Air
Sensor circuit or
wiring.
1. Check TS194(Q) for
internal short ciruit.
See Temperature
Sensor Function of
Preliminary Circuit
Analysis (pg. 28).
Connect test
resistor as
described in step
2 of Preliminary
Circuit Analysis
(pg. 27) and follow
procedure outlined.
Replace TS194(Q)
if necessary.
2. Faulty MP2 2. Perform Remedy
for Possible Cause
1 above.
If modulating
voltages are still not
obtained, MP2 may
be assumed faulty.
Replace.
F.
Continuous high
re (electronics
OK).
1. Foreign object
holding valve open.
1. Remove bottom
plate and inspect
valve and seat.
2. Plunger jammed. 2. Inspect. Plunger
should be smooth,
clean and operate
freely in solenoid
sleeve.
Clean or replace
plunger if
necessary. Do not
use lubricants of
any type.