34 CVS-21HA.rev.03
PROBLEM
CHECK POINTS
There is no
display.
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 interconnect cable is not
plugged into the power supply board properly.
Be sure the cable is firmly plugged in.
The controller has detected a defective probe.
Follow the procedure described in DEFEC-
TIVE PROBES (page 11) to identify the
defective probe. Replace the defective
probe.
The defective
probe pilot light
is on.
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.
The display
shows sudden
variations in the
room tempera-
ture.
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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