Market Forge Industries M36G200A-4SP ユーザーズマニュアル

8

Pilot will not ignite or does not hold.

Gas not reaching unit.
Main “gas cock knob” not  in 

ON position.
Air pocket or clog in gas line.
Defective wiring or poor con-

nection at pilotstat power unit.
Defective switching across 

either the water level control or 

pressure switches.
Defective gas valve.

1.
2.

3.
4.

5.

6.

Check to make sure gas is  on 

and gas line is purged of air.
Depress and turn “main gas 

cock” to pilot 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.

1.

2.

3.
4.
5.

6.

Water enters boiler very slowly.

Clogged strainer screen on 

water fill solenoid valve
Debris or lime accumulation on 

seat of  water fill valve.

1.

2.

Clean or replace strainer 

screen. (P/N 08-4871).
Clean valve seat

1.

2.

Boiler overfills with water

Probes scaled.
Water supply valve fails to 

close.
Defective water level control.

1.
2.

3.

Clean.
Clean valve seat or replace 

valve.
Follow the test procedure on 

page 11. Replace if defective.

1.
2.

3.

Main Burners will not ignite or will 

not remain lighted.

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.

1.
2.

3.
4.
5.

Check to be sure water switch 

is on. Check to be sure main 

water supply is on and the elec-

trical supply to unit is on.
Open.
Reset - if continuity check 

shows to be defective - replace.
Check main fuse.
Replace.

1.

2.
3.

4.
5.

Boiler fails to build up any pressure 

when the water is at the correct 

level and the fuel switch is turned 

on.

Check to see that main gas is 

turned on.
Check to see that gas valve is 

in burners “on” position.
Current flow is broken at water 

level control (ascertain with 

continuity check).
Current flow is broken at pres-

sure control or high limit control 

switches (ascertain with conti-

nuity check).

1.

2.

3.

4.

Turn on.
Turn to burners “on”.
Check for voltage thru right 

side of control board, replace if 

defective.
Re-adjust to proper setting - 

refer to instruction for re-adjust-

ment, replace if defective.

1.
2.
3.

4.

Water level in gauge glass 

fluctuates up and down.

Top shutoff valve on water 

gauge glass is closed.

1.

Open.

1.