Finish Thompson LS-55IIE User Manual
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6. Verify that power is getting to the temp board. There should be 24 V.D.C. between wires # 3 (pos.) pin 21 on the
temp board and wire # 11 (neg.) pin 23 on the temp board. If this is not the case, than the cycle timer could be
defective. The timer can be bypassed by jumping a wire between wire #7 pin 2 on TIM-l and wire #3 pin 1 on
TIM-I. If this works, then replace the cycle timer.
7. Verify that K2 contactor on the temp board is closing (when the unit is turned on) by measuring for voltage
between wire #11 and wire #9 on pin 14 (temp board). If no voltage is present, K2 may be faulty and the temp
board must be replaced. If 24 V.D.C. is present, K2 is closed and all right.
8. Verify that Kl contactor on the temp board is closing (when the unit is turned on) by measuring for voltage
between wire #11 and wire #10 on pin 11 on the temp board. If no voltage is present, and all previous tests
check out, than Kl may be faulty and the temp board must be replaced. If 24 V.D.C. is present and K1 is closed,
then the temp board is all right. If the temp board checks out, call the factory for further information.
9. This set of troubleshooting tips will help verify a faulty temp board. Most problems lie within the water supply
system or the flow switch. It is common for scale and other debris to build up in this switch, causing the
symptoms you are experiencing. A Y-strainer should be used on the incoming water supply to help prevent these
problems.
Advanced Troubleshooting Tips: LS 15IIE I LS55IIE CONTINUED…