Hubbell Electric Heater Company J manual No Display Is the circuit Breaker tripped at Source?

No Display

Is the circuit

breaker tripped at

source?

No

Is the circuit

breaker tripped

inside heater (if supplied)?

No

Press ON/OFF button on heater

	Reset circuit
Yes
	breaker

	Reset circuit
Yes
	breaker

OK?

No

Diagram 4

208/240V

J5

1

2

3

4

	Is correct voltage
	measured at power					Check incoming
distribution block or line				No
							power
	side of contactor for
	each phase?
		Yes
	Is there 480V at
	the line side of the
					No		Check wiring
	transformer
(480V models only)?
		Yes
	Is there
208/240V at the load side							Replace
				No
	of the transformer						Transformer
(480V models only)?
		Yes
	Is there
	208/240V across
terminals 1 & 2 of J5 on
			No				Check wiring
	the control
	board? (see
	diagram 4)
		Yes
	Re-seat ribbon							No
	cable from control						OK?
	board to display

Contact factory

No

OK?

	Replace digital		Replace control
	display		board
		Yes
	Is there			No
24VDC ± 5VDC across
D1 & ground (J7) on the
	control board?

25