AUGUST 29, 2014
4
M24G & M36G GAS BOILERS
TROUBLESHOOTING
TROUBLE
POSSIBLE CAUSE
(S)
REMEDY
Boiler fails to reach full operating pres-
sure 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
Safety valve not seating properly.
Purge manually or replace.
Water level too high.
Adjust water level control - check wa-
ter feed valve for sticking - clean or re-
place.
Air vent not venting properly.
Replace.
Insufficient flames on burners or im
-
proper gas supply.
See instructions on gas adjustments
Safety valve blows off prematurely.
Pressure set too high.
Readjust pressure control.
Pressure gauge reads incorrectly.
Replace.
Lime or debris on seat of valve
Purge or replace.
Boiler builds up to pressure, shuts
down, fails to come back on.
High limit switch set to low or operating
pressure control switch set too high.
Follow instructions for readjusting Re-
place if defective.
Water does not enter boiler.
Main water supply off.
Turn on.
Power not reaching unit.
Check main fuse or circuit.
Probes Dirty.
Remove & Clean
Water level control board defective.
See test procedure.
Solenoid valve defective
If Voltage is verified at solenoid coil, but
fails to open, replace solenoid.
Cold water condenser does not func-
tion.
Main water supply off.
Turn on.
Thermostat defective.
Replace if defective.
Loose coil nut.
Tighten coil nut.
Solenoid coil not energized.
Check coil for continuity, if open re-
place.
Air vent leaking.
Not closing.
Replace.
