Hubbell Electric Heater Company E User Manual download pdf (Page 12)

SECTION IV – TROUBLESHOOTING

Symptom Probable Cause Corrective Action / Remedy

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.

No hot water

Faulty low water cut-off, if

installed.

Check to see if tank is full of 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.

Faulty thermostat. Check thermostat adjustment. Monitor

thermostat as described in Section III,

Quarterly Inspection. Replace if necessary.

Heating element not working on

all phases

Check to see that heating element is

working on all phases, by checking the

resistance (ohms) value for each element

and comparing with the chart included in

Section VI.

Water temperature

below settings at all

times

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

continuously

Excessive temperature or

pressure in tank

Temperature and pressure relief valves 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.

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Hubbell Electric Heater Company E User Manual Page 12

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