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No Display
Is the circuit
breaker tripped at
source?
Reset circuit
breaker
Is the circuit
breaker tripped
inside heater
(if supplied)?
Yes
No
No
Press ON/OFF
button on heater
Is correct voltage
measured at power
distribution block or line
side of contactor for
each phase?
Reset circuit
breaker
Yes
OK?
Check incoming
power
No
No
Is there 480V at
the line side of the
transformer
(480V models only)?
No Check wiring
No
Yes
Replace
Transformer
OK?
Yes
Is there
208/240V at the load side
of the transformer
(480V models only)?
Is there
208/240V across
terminals 1 & 2 of J5 on
the control
board? (see
diagram 4)
Re-seat ribbon
cable from control
board to display
Check wiring
Yes
Yes
No
Replace digital
display
Replace control
board
J5
208/240V
OK?
Contact factory
No
Diagram 4
1
2
3
4
Is there
24VDC ± 5VDC across
D1 & ground (J7) on the
control board?
No
Yes
No