My '99 has two basement airs with two compressors each. Using a clamp on ammeter I determined that the second compressor on each unit was never operating. Each board had a different problem, but they were easily fixed and now I have wonderful cooling and stay at whatever temperature I desire in this very hot and high humidity summer. I had to order several more relays than I needed to meet minimum quantity requirements and would be glad to assist anyone that needs their board repaired. I have the schematic and a test rig I cobbled together to verify correct operation before installing the board. This assumes, of course, your fans and compressors are in good working condition, which luckily, mine were. Russ
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