Page 17
1. Symptom: heater is pounding, knocking or emitting steam from relief valve
Possible Cause
What to Do
A. Low or no water
fl
ow
A. Is the heater wired into the
fi
lter pump circuit so that the heater cannot
fi
re
?
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C
B. Debris from system piping
B. Remove header covers. Examine all tubes and waterways. Clean out tubes.
is blocking tubes.
Use new gaskets when reassembling.
C. Scale has formed in tubes
C. Clean tubes with tube cleaning kit. Determine hardness. Check water
fl
ow, and
from high mineral content.
clean pool
fi
lter.
2.
Symptom: heater will not fi
re
A. Heater not getting power.
A. Check to see that power switch is "ON." Use testing device to trace power to
.
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B. Operating or safety control has
B. Turn off power. Check continuity across terminals of each operating and safety
opened circuit to electric gas valve.
control switch up to the electric gas valve. Replace defective control.
C. Pilot
fl
ame is out.
C. Relight pilot per instruction.
D. Manual reset device has tripped.
D. Reset pilot safety and all manual reset safety switches. Follow instructions for
.
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E. No gas pressure to burners.
E. Trace gas line to service shutoff cock. If service cock is open, trace gas line to
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F.
Electric gas valve operator is
F.
Disconnect wiring harness at gas valve terminals. Check continuity of actuator
burned out or shorted.
coil. If open circuit or short is indicated, replace coil or operator.
G. Pump does not run.
G. Operate in manual. Check power to pump from relay, Check that pump/motor is
.
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H. Pump runs, but
fl
ow switch
H. Check continuity across
fl
ow switch. Inspect paddle for proper movement.
.
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Field interlock open.
I.
Jumper terminals and isolate problem in other equipment.
3. Symptom: pressure relief valve leaking intermittently or steadily
A. Faulty relief valve.
A. Replace with a new relief valve with proper setting (see rating plate).
4.
Symptom: soot in fl
ueways or in tubes, or noxious fumes from bad combustion
A. Combustion air supply to heater
A. Check air supply opening. Look for debris in screen or louvre which covers
room is inadequate.
combustion air opening, or for objects blocking the opening.
B. Stack or vent is blocked or restrictive. B. Look for blocked stack and excessive number of elbows in stack or excessive
.
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C. Severe downdraft is causing
C. Check for (1) proper vent cap on stack; (2) adequate height of stack above
spillage of
fl
ue products into room.
roof; (3) equipment exhausting air from inside of building; and (4) proper
.
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D. Gas pressure to burners is excessive. D. Check gas pressure with manometer, and adjust with heater
fi
ring at full rate.
E. Heater not
fi
tted for the fuel supplied. E. See nameplate for correct fuel.
F.
Heater installed at high altitude
F.
Installations at altitudes in excess of 2000 ft. above sea level are subject to
without proper derating.
jurisdiction of the local inspection authorities. Check ori
fi
ce size, contact your
.
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5.
Symptom: water dripping in fi
rebox
A. Tube in heat exchanger has
A. Tube failure is almost always caused by scale formation in the tube, or
overheated and ruptured.
inadequate water
fl
ow through the heater.
B. Heater is condensing from low
B. Check bypass valve adjustment.
inlet temperature.
MightyTherm Pool Heater
