Hubbell Electric Heater Company D manual Section Iv - Troubleshooting, Symptom, Probable Cause

SECTION IV – TROUBLESHOOTING

Symptom	Probable Cause	Corrective Action / Remedy
No hot water	Circuit breaker tripped at source.	Reset circuit breaker.
	Blown fuse in transformer, if	Replace fuse.
	installed.
	Circuit breaker at control cabinet	Reset circuit breaker.
	tripped, if installed.
	Blown fuse in element fuse block,	Replace fuse.
	if installed.
	High limit switch tripped.	Reset high limit switch.
	Loose wires.	Tighten wires. Torque screws
		per torque chart included in
		Section VI.
	Heating element inoperable.	Check heating element
		operation by clamping an
		Amprobe around each wire to
		the element. The ampere
		reading should agree with the
		nameplate ‘AMP’ figure.
	Low line voltage.	Have source electrical system
		checked by an electrician.
	Faulty thermostat.	Move thermostat dial through
		full range. A definite ‘click’
		should be heard. If not, replace
		thermostat.
	Faulty low water cut-off, if	Check to see if tank is full of
	installed.	water. If not, fill tank. If problem
		continues and tank is full, check
		for continuity between the
		common and normally open
		contact of the relay board. If
		continuity is not observed,
		replace low water cut-off.
	Magnetic contactor does not	Replace complete magnetic
	energize.	contactor. Because of the design
		of this particular contactor, it is
		more desirable to replace
		complete control rather than
		rebuilding coil, contacts and
		springs, etc.

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