Hubbell Electric Heater Company J - Manual (Page 29)

29
Symptom Probable Cause Corrective Action
Temperature and
pressure relief valve
seeps No pressure reducing
valve or wrong valve
installed causing
excessive pressure in
the unit. The proper pressure reducing valve with high
pressure bypass must be installed in the inlet
water line to allow for the expansion of water.
Pressure reducing valve
bypass is blocked. Clean the bypass or install a new valve with a
built-in bypass.
Anti-siphon valve or
check valve installed in
the warm water inlet
line. Remove the anti-siphon valve or the check
valve to allow for the expansion of the water
or install a back pressure relief valve.
Temperature and
pressure relief valve
opens and/or high
limit temperature
error occurs. Unit is overheating due
to improper P65 probe
calibration. See the ‘P65 Probe Troubleshooting’ section.
Unit is overheating due
to the magnetic
contactor staying in the
closed position. See the ‘Magnetic Contactor Troubleshooting’
section.
Booster heater does
not heat at all. Main supply circuit
breaker tripped. Check and/or reset the circuit breaker.
Booster heater circuit
breaker tripped. If unit is supplied with a circuit breaker, check
and/or reset the circuit breaker.
Booster in high limit. If a high limit error occurs, allow water to cool
and press the reset button. If error continues
see symptom “Temperature and pressure relief
valve opens and/or high limit temperature
error occurs”.
Low water error. Verify that booster heater is full of water. If
error is still present see the ‘P65 Probe
Troubleshooting’ section.
Magnetic contactor
does not energize. See the ‘Magnetic Contactor Troubleshooting’
section.
No power to control
board (T1000) or
display (TD1000) not
lit. Reseat the display (TD1000) ribbon cable in
the control board (T1000) connector. If the
display is still not lit, see the ‘Control Board
(T1000) / Display (TD1000) Troubleshooting’
section.
Element Failure Disconnect the wires from each element and
verify that the resistance (ohms) value for each
element is correct. Replace elements as
required.