Troubleshooting - Market Forge Industries M24G Parts And Service Manual

TROUBLE
Pilot will not ignite or does not
hold.
Water enters boiler very slowly.
Boiler overfills with water.
Main Burners will not ignite or will
not remain lighted.
Boiler fails to build up any pres-
sure when the water is at the
correct level and the fuel switch is
turned on.
Boiler fails to cut off after reaching
operating pressure.
Water level in gauge glass fluctu-
ates up and down.
AUGUST 29, 2014

TROUBLESHOOTING

POSSIBLE CAUSE(S)
Gas not reaching unit.
Main "gas cock knob" not in ON position. Depress and turn "main gas cock" to pilot
Air pocket or clog in gas line.
Defective wiring or poor connection at pi-
lots at power unit.
Defective switching across either the wa-
ter level control or pressure switches.
Defective gas valve.
Clogged strainer screen on water fill so-
lenoid valve
Debris or lime accumulation on seat of
water fill valve.
Probes scaled.
Water supply valve fails to close.
Defective water level control.
No water in boiler.
Main gas cock or supply line not open.
Pressure switch set too low.
No voltage to gas valve.
Gas valve defective.
Check to see that main gas is turned on. Turn on.
Check to see that gas valve is in burners
"on" position.
Current flow is broken at water level con-
trol (ascertain with continuity check).
Current flow is broken at pressure control
or high limit control switches (ascertain
with continuity check).
Pressure switch set too high or defective. Adjust or replace if defective.
Gas valve fails to cut off gas supply when
demands of pressure switch have been
met.
Top shutoff valve on water gauge glass
is closed.
3
REMEDY
Check to make sure gas is on and gas
line is purged of air.
position - (refer to lighting instructions).
Purge or blow out gas line.
Check - replace or tighten.
Make continuity check – replace units
that are defective.
Replace gas valve.
Clean or replace strainer screen. (P/N
08-4871).
Clean valve seat
Clean.
Clean valve seat or replace valve.
Follow the test procedure. Replace if de-
fective.
Check to be sure water switch is on.
Check to be sure main water supply is on
and the electrical supply to unit is on.
Open.
Reset - if continuity check shows to be
defective - replace.
Check main fuse.
Replace.
Turn to burners "on".
Check for voltage thru right side of control
board, replace if defective.
Re-adjust to proper setting -refer to in-
struction for re-adjustment, replace if de-
fective.
Replace gas valve.
Open.
M24G & M36G GAS BOILERS