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Heatmaster
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G Series Furnace Operating Manual
ELECTRICAL TROUBLESHOOTING
Electrical troubleshooting should always be done by a
qualified technician.
High Limit Switch:
Alarm High Limit should be displayed on the control screen.
Using an electrical testing meter check for power on both
poles of the high limit switch. If the furnace temperature is
above 195° F. the switch should be OPEN and there should
only be power on one side of each switch. 24V DC on the
red and 115V AC on the black. If the furnace was over 195°
F. and the switch has opened the water will need to cool
down to approximately 150° F. before it will close and allow
power through once again.
•
If the furnace has not overheated (195° F+) but there is
still power on only one side of the switch, the switch is
faulty and should be replaced.
•
If there is no power on either side of each switch, check
for power at the main power switch at the rear of the
furnace.
Control power supply switch:
Using an electrical testing meter check for power on both
poles of the power supply rocker switch. The switch has
power in, neutral, and power out poles. During normal
operation, there should be power at the power in and power
out poles.
•
If there is only power on one of the poles, check to make
sure the switch is in the “on” position.
•
If the switch is “on” and there is only power on one pole
the switch is faulty and should be replaced.
•
If there is no power on either the power in or the power
out pole check for power at the rear main power switch.
Siemens 24V DC Power Supply:
•
Using an electrical testing meter check for DC voltage at
the OUTPUT terminals.
•
If there is 24 volts DC across the terminals and the
green LED on the front is illuminated the power supply is
working.
•
If there is not 24 volts DC check for 115V AC power on
the INPUT terminals. If there is no power check for power
at the control power switch.
If there is 115V AC on the INPUT terminals but not 24V DC
TROUBLESHOOTING
•
The door may need to be adjusted. To do this loosen the
door latch bearings and nuts on the door hinge and set the
door so it seals tightly against the door jamb.
Re-tighten once the door is in place.
If the furnace has an excessive amount of creosote:
•
Check to ensure the furnace is sized accurately according
to heat demand. If the furnace is oversized it will idle and
cause this.
•
Check moisture content in your wood fuel. Moisture content
over 30% may cause creosote buildup.
Recommended moisture content in your wood fuel is 15-
25%.
•
Remove the access panel at the rear of the furnace and
inspect the bypass door for smoke leakage.
•
If the chimney and/or heat exchange tubes become
plugged with creosote it will be necessary to scrape the
creosote out to obtain a proper burn in the firebox.
You are having to fill the furnace with water more than once
a week or more than a few gallows of water per week and
there is no obvious explanation:
•
Check and confirm that the temperature set-point is not
higher than 180 F. Hotter water temperatures will cause
increased evaporation.
» Check the gaskets on the upper and lower firebox
doors. Air leaks in door gaskets will allow continued
combustion and potential overheating.
•
Check the perimeter of the furnace for water puddles
collecting or dripping from the furnace.
•
Check all plumbing in the system to ensure there are no
leaks.
•
If these checks have not provided an answer call your
dealer.
