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 shorted 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

Yes Go to Step #2

L1-L2 at the board to be 120 VAC + 15V. No Correct external supply problem

2. Remove two AC power wires from control

board and connect ohmmeter to control

Yes Reconnect power and go to Step #3

board power terminals. Is resistance

between 100-1000 ohms?

No 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