SEPTEMBER 2, 2014 3 M24E & M36E ELECTRIC BOILERS
GENERAL TROUBLESHOOTING
TROUBLE POSSIBLE CAUSE REMEDY
Water does not enter the boiler. Water main shut-off Turn on
Power not reaching unit Check main fuse or circuit
Probes dirty Remove and clean
Water level control board defective Refer to test procedure in this manual
Solenoid valve defective If 120V is veried at solenoid coil, but fails to
open, replace solenoid
Boiler fails to build up pressure
when water level is proper and
fuel switch is turned on.
Check to see that circuit breaker in main is
turned on
Check for voltage at terminal block
Check to see that contactors are pulling in Check continuity of coil, if open replace
Current ow is broken at water level control (as-
certain with continuity check)
Check for voltage at L1 and L2, replace if de-
fective
Current ow is broken at pressure control or
high limit control switches due to maladjustment
or defect (ascertain with continuity check)
Readjust - to proper setting - refer to instruc-
tions for readjustment, replace if defective
Heating elements are defective Replace if continuity check through the circuit of
each element shows defective
Boiler fails to reach full operating
pressure of 5 lbs. or 15 lbs.
Pressure gauge reads inaccurately Replace
Pressure control and high limit control switches
are out of adjustment
Follow instructions for readjusting or replace if
defective
Safety valve not seating properly Clean or replace
Contactor coils (one or both) not energizing and
closing circuit to the heating elements
Check - replace either contactor coils or com-
plete contactor – if found defective. Measure
amperage at terminal block check to be sure
there is an even draw on all three phases - see
wiring diagrams for correct AMP draw. If uneven
or zero amperage draw is found on one of the
three phases, check for blown fuse. If fuse is
OK, shut off power, remove wires from heating
elements and run continuity check - replace if
defective.
Water enters boiler very slowly. Dirty Strainer screen in solenoid valve. Clean or replace strainer screen, part no. 08-
4871.
Water level in gauge glass uctu-
ates up and down.
Top shut off on water gauge is closed. Open
Contactor chatters Incorrect supply voltage. Check to see that it matches it with coil contac-
tors
Dirty or worn contactor points. Clean or replace contactor
Weak coil Replace with correct voltage coil
15 lbs. safety valve blows off pre-
maturely
Pressure set too high Readjust
Pressure gauge reads incorrectly Replace
Mineral build-up or dirt on seat of valve Clean
Weak spring valve Replace valve
Boiler build up to pressure, shuts
down and fails to come on
High limit switch set too low or operating pres-
sure control switch set too high
Follow instructions in this document for read-
justing, or replace if defective
