Hubbell Electric Heater Company E manual Section IV Troubleshooting

SECTION IV – TROUBLESHOOTING

Symptom	Probable Cause	Corrective Action / Remedy
No hot water	Circuit breaker tripped at source.	Reset circuit breaker.
	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 water. If not,
	installed.	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.
Water temperature	Faulty thermostat.	Check thermostat adjustment. Monitor
below settings at all		thermostat as described in Section III,
times		Quarterly Inspection. Replace if necessary.
	Heating element not working on	Check to see that heating element is
	all phases	working on all phases, by checking the
		resistance (ohms) value for each element
		and comparing with the chart included in
		Section VI.
	Heater improperly sized	Verify heater is properly sized for the flow
		rate and temperature rise of your system.
		See formulas included in Section VI.
		Replace elements with proper size as
		necessary.
Relief valve	Excessive temperature or	Temperature and pressure relief valves are
discharges	pressure in tank	made to operate if the water temperature
continuously		exceeds 210°F or water pressure exceeds
		the pressure rating of the safety relief valve.
		If trouble is excessive temperature, then
		thermostat is not shutting off at the right
		setting and thermostat must be replaced.

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