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MorrHeat - Most Heat In The Industry - Rev 3/18/2019
Troubleshooting
1. Check burner power switch and make sure power is available to the whole control system.
2. If included in the system, check low-water, cutoff and/ or manual reset high limit.
3. Check room thermostat(s) and zone valves or pump relays (if used).
4. Make sure there is oil in the tank.
5. Inquire if reset button on burner oil primary control has been tripped. If the reset button continues
to trip them DO NOT ATTEMPT TO START BURNER.
Open burner door by disconnection the plug-in lead and remove the four hex head bolts. Examine
the combustion chamber for unburned oil and oil vapor. If present, clean up oil.
With burner door open check cad cell for soot or dirt deposits, check nozzle and if clogged, replace
with a nozzle of identical make and style. Check electrodes for proper gap and for soot or oil
deposits. Also, check porcelains for cracks.
Close burner door and re-connect electric cord. Press the reset button while watching through the
observation port. If burner fires immediately and flame looks good cycle several times.
If the burner does not fire immediately, or if it fires but flame looks ragged and/or smoky, shut
burner down and check the fuel delivery system. The problem may be air in the intake line so tighten
all fitting and tighten the unused intake port plug. Also, check the filter cover and gasket.
Also, check the pump filter and clean it with a brush and fuel oil or kerosene if it looks dirty.
NO HEAT:
INADEQUATE HEAT:
1. Check thermostat and heat anticipator setting. A wrong setting can cause short cycling and
inadequate heating.
2. Check to see if the distribution system is air-bound. If the pump and boiler are running and the
pipe connection to the boiler supply port is hot, check the pipe temperature at the inlet to the fir
radiator. If it is cool or only lukewarm, then the problem is a lack of circulation. Look for air in the
system, a valve partially closed, a zone valve failed in the closed position. pump failure. The most
common fault is air in the system.
RELIEF VALVE LEAKS CONSTANTLY:
1. Check system pressure. With system hot, pressure should be in the 20 psi to 25 psi range, not to
exceed 25 psi. With system cold, pressure should be in the 12-14 psi range. If the pressure is over
these ranges, then suspect the pressure reducing fill valve or the expansion tank. A diaphragm tank
may be too small, may have a ruptured diaphragm (this would cause a very sharp rise in pressure as
system water heats up and sudden opening of the relief valve) or maybe over pressurized. A closed
type expansion tank may be undersized, may be improperly piped to the boiler, maybe waterlogged.
2. The relief valve may be defective, or it may have foreign material lodged on the seat.
