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

SECTION IV – TROUBLESHOOTING

Symptom	Probable Cause	Corrective Action / Remedy
No hot water in tank	Circuit breaker tripped at source.	Reset circuit breaker.
	High limit switch tripped.	Reset high limit switch.
	Loose wires.	Torque screws holding wires.
	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.
Water temperature in	Faulty thermostat.	Check thermostat adjustment. Monitor
tank below settings at		thermostat as described in Section III,
all times		Quarterly Inspection. Replace if necessary.
	Heating element not working on all	Check to see that heating element is working
	phases	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. Replace
		elements with proper size as necessary.
Relief valve discharges	Excessive temperature or pressure	Temperature and pressure relief valves are
continuously	in tank	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.
Tepid water	Blockage in cold water inlet to	Disconnect mixing valve and clean out cold
temperature too hot	mixing valve	water inlet pipe.
	Mixing valve out of calibration	Re-calibrate mixing valve as described in
		Section V, Service and Replacement of Parts,
		Re-Calibrate Mixing Valve.
Tepid water	Blockage in hot water inlet to	Disconnect mixing valve and clean out hot
temperature too cold	mixing valve	water inlet pipe.
	Mixing valve out of calibration	Re-calibrate mixing valve as described in
		Section V, Service and Replacement of Parts,
		Re-Calibrate Mixing Valve.

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