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
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| Reset circuit |
Yes |
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| breaker | |
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| Reset circuit |
Yes |
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| breaker | |
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OK?
No
Diagram 4
208/240V
J5
1
2
3
4
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| measured at power |
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| Check incoming |
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distribution block or line |
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| power |
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| side of contactor for |
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| each phase? |
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| Yes |
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| Is there 480V at |
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| the line side of the |
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| No |
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| transformer |
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(480V models only)? |
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| Yes |
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208/240V at the load side |
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| of the transformer |
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| Transformer |
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(480V models only)? |
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| Yes |
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| 208/240V across |
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terminals 1 & 2 of J5 on |
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| No |
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| Check wiring |
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| the control |
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| board? (see |
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| diagram 4) |
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| Yes |
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| No |
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| cable from control |
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| OK? |
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| board to display |
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Contact factory
No
OK?
| Replace digital |
|
| Replace control | ||||||
| display |
|
| board | ||||||
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| Yes |
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| Is there |
| No |
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24VDC ± 5VDC across |
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| ||||||
D1 & ground (J7) on the |
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| control board? |
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25