54
Power cycle the heater, in an attempt to clear the
“b1” code. IF power cycling clears to the “b1” code
and heater fires, drop temperature to suspend
heating. IF “b1” reappears, go to step 15B.
Test incoming power
Power cycle heater
Unplug the wire harness from the P1 terminal and
test voltage on the harness (115VAC or 230VAC). IF
incoming voltage is out of range (+/-10%), correct
incoming voltage. Otherwise, replace the ICB (pg. 25).
OFF
ON
Step 15A
15. Service LED ON: “b1” Code
“b1” Code stands for “Ignition Control Board (ICB) data error”. If the ICB does not satisfy self-diagnostic on
power up or initial trial for ignition, the ICB will lock out until error condition is corrected.
b I
Step 15B
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