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TROUBLESHOOTING GUIDE
PROBLEM
There is no
display.
The display shows
the letter "p".
The defective
probe pilot light
is on.
The display
shows sudden
variations in the
ambient tempera-
ture.
38
TC4-NVS/P.rev.05
CHECK POINTS
The circuit breaker at the service panel is off
or tripped.
Reset the circuit breaker.
The wiring is incorrect.
Correct the wiring.
The input fuse is open.
Replace the fuse.
The voltage selector switch is in the wrong
position.
Set the switch to the correct position.
The display board inter-connect cable is not
plugged into the power supply board properly.
Be sure the cable is firmly plugged in.
Probe # 1 is connected improperly.
Correct the probe's connection.
The controller has detected a defective probe.
Follow the procedure described in DEFEC-
TIVE PROBES to identify the defective
probe. Replace the defective probe.
A variation in resistance is induced on the probe
circuit.
Be sure the probes are dry. Also, move
them away from drafts and from any source
of radiant heating.
There is electrical noise near the cable of an
extended probe.
Do not run probe cables next to other
power cables. When crossing over other
power cables, cross at 90°.
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