Repair manual

A) SYMPTOMS OF WATER LEVEL CONTROL RELATED PROBLEMS:

1) Boiler overfills or floods

2) Boiler dry fires (system underfills or doesn't fill)

3) Boiler doesn't fill at all

4) Water fill solenoid chatter

5) Heater contactor chatter

6) Fills but cuts out on LOW WATER before filling again

7) Overfills but does not heat

8) Fills but does not heat

B) POSSIBLE CAUSES:

1) Inoperative water level control circuit board (P/N 23198)

2) Incorrect or damaged wiring to probes

3) Incorrect or damaged wiring from water level board to loads

4) Damaged probes

5) Probes snorted together

6) Scale build-up on probes

C) FAULT ISOLATION PROCEDURE:

Equipment Required: Volt/Ohmmeter (VOM) or Multimeter

STEP

TEST

RESULT

REMEDY

1. Is power applied to the control circuit board? Measure

L1-L2 at the board to be 120 VAC + 15V.

Yes

Go to Step #2

Correct external supply problem

2. Remove two AC power wires from control board and

con

nect ohmmeter to control board power terminals. Is

resistance between 100-1000 ohms?

Yes

Reconnect power and go to Step #3

Replace control board P/N 23198

(inoperative

transformer)

3. Visually inspect probe wiring for damaged or broken

wires or loose or missing terminals at either end. Is

wiring visually OK?

Yes

Go to Step #4

Replace wiring as required