Hubbell Electric Heater Company HSE - Manual (Page 13)

13
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
Magnetic contactor does not
energize. Replace complete magnetic 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.
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.