Hubbell Electric Heater Company HE, HSE 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.
	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.
	Magnetic contactor does not	Replace complete magnetic contactor.
	energize.	Because of the design of this particular
		contactor, it is more desirable to replace
		complete control rather than rebuilding
		coil, contacts and springs, etc.
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 discharges	Excessive temperature or	Temperature and pressure relief valves
continuously	pressure in tank	are made to operate if the water
		temperature 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.
		13