Hubbell Electric Heater Company J - Manual (Page 30)

CONTROL BOARD (T1000) / DISPLAY (TD1000) TROUBLESHOOTING
1. Verify proper power supply voltage between each phase (L1 to L2, L2 to L3, and L1 to
L3). The power supply voltage should match the voltage listed on the booster nameplate.
If voltage is incorrect, check main supply wiring or replace unit with proper booster
heater.
2. Check for 208/240VAC between pin 1 (white wire) and pin 2 (black wire) of the J5
connector on the T1000 control board. If no voltage is present, skip to step 4.
3. If 240VAC is present, check for 24VDC between D1 and ground. If 24VDC is present
replace the display (TD1000). If 24VDC is not present replace the control board (T1000).
Ground Wire (J7) Display Cable Leak Detection Wire (J2) Probe Cable (J3)
(D1)
Power Wire (Common, White) Connector (J5)
Power Wire (Black) Wire to #1 Contactor (yellow)
Wire to #2 Contactor (red)
4. If a transformer is installed, verify proper power supply voltage to the primary side of the
transformer and verify approximately 240VAC on the secondary side of the transformer.
If voltage is present of the primary side but not on the secondary side, replace the
transformer.
5. If circuit breakers are installed, verify that the circuit breaker is ON. Verify proper power
supply voltage between each phase (L1 to L2, L2 to L3, and L1 to L3) to the line side of
each circuit breaker and to the load side of each circuit breaker. If voltage is present of
the line side but not on the load side, replace the circuit breaker.
6. Verify that the booster heater is wired according to the proper wiring schematic for the
unit. Correct as required. If unit still does not operate, contact the factory.
MAGNETIC CONTACTOR TROUBLESHOOTING
1. With the unit ON and calling for heat, check for lit decimal points on the display. If the
unit has a single contactor, the first decimal to the right of the display should be lit. If two
decimals are lit, verify that the configuration is set for one contactor. If the unit has two
contactors, verify that two decimals are lit. If only one decimal is lit, verify that the
configuration is set for two contactors. If no decimals are lit, continue to the ‘P65 Probe
Troubleshooting’ section.
2. With the unit ON and calling for heat and one decimal lit, check for 240VAC between
pin 1 (white wire) and pin 4 (yellow wire) of the J5 connector on the T1000 control
board. If no voltage is present, replace the control board (T1000). If voltage is present,
check for voltage across the contactor coil. If voltage is present at the contactor coil,
replace the magnetic contactor. If no voltage is present, verify that the booster heater is
wired according to the proper wiring schematic for the unit.
3. If the unit has two contactors, with the unit ON and calling for heat and two decimals lit,
check for 240VAC between pin 1 (white wire) and pin 3 (red wire) of the J5 connector
30