Heatmaster C-250 - Furnace Operational Troubleshooting

19HeatMaster
SS
C Series Furnace Operating Manual
C
TROUBLESHOOTING
If furnace is running but fails to bring water up to temperature:
1. Check re.
2. Check fan for operation.
3. Check that the damper and blower box elbow is open to
allow air injection.
4. Check to ensure the furnace is sized accurately according
to heat demand.
5. Check fuel type. Poor-quality fuel will not provide as many
BTUs as high-quality fuel.
6. Check water level of the furnace.
7. Check for ash and creosote blockage at the chimney and
bypass trough.
8. Check temperature settings. Make sure high-temperature
setting is set to at least 165 F.
9. Check for power at the furnace.
10. Check to ensure all pumps in the system are running.
11. Check to make sure there are no leaks, hot/wet spots on
your ground, or breaks in the pipe or ttings which may
cause the pipe to be saturated and lose its insulation value.
12. Check temperature of water exiting the furnace, entering
the building being heated, and before and after each heat
exchanger.
If the furnace water is hot but buildings do not have heat:
1. Check to ensure all pumps in the system are running.
2. Check ller cartridge for ow blockage (if installed).
3. Check for air in the system at the exchanger by bleeding off.
4. Check for closed valves to ensure water ow.
5. Check the temperature of water exiting the furnace,
entering the building being heated, and before and after
each heat exchanger.
If the furnace overheats:
1. Check that all doors are closing properly and that the door
gasket is completely sealing.
2. Check that the damper plate is opening and closing without
hang-ups.
3. Check venting and fan box on rear of furnace for air leaks.
4. Check that the temperature settings are correct. The
furnace should be set on Heating Mode (H1) and the high-
temperature setting should be set no higher than 185° F.
5. Check the chimney draft. If the chimney has been extended
too far or has a strong wind blowing over it, it may cause a
draft down the furnace.
6. Check water level.
7. Make sure the door and ash drawer are airtight.
8. Check to ensure all pumps in the system are running.
If the furnace has shut down:
1. Check to ensure that the unit has power (does the light
work?).
2. Check to ensure the Furnace On/Off switch is in the On
position.
3. Check the water temperature (the furnace has a high
temperature cut out of 190 degrees F. and turns on again
at 140 degrees).
If there is a chimney re:
1. Make sure the rebox and ash pan doors are tightly closed.
2. Close all combustion air inlets on the furnace.