Test F1 (3AMP) fuse
On the ICB, locate and test the 3A fuse for
continuity. IF fuse is blown, replace it and go to
Page 30. IF Ok, go to step 1K.
On the ICB, verify 22–28VAC between AC & COM
terminals (pins 1 & 4). IF voltage is present, replace
display/bezel/keypad. IF no voltage, replace ICB
(pg. 25).
Test ICB’s display output
Step 1J
Inspect wiring
Inspect ICB wiring, ensuring all plugs are securely
fastened. IF wiring is OK go to Step 1I. IF NOT,
secure wiring/plugs then retest.
Disconnect and test the red and grey wires from
the ICB. IF 22-28VAC is present go to step 1J. IF
NOT, replace wire harness (pg. 25).
Test ICB input (low voltage)
33
1. Heater Not Powering Up (cont.)
Step 1H
Step 1I
Step 1K
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