Verify that you have 24v going to the contactor (on sides) during a call for cooling. Assuming voltage is present, your contactor most likely...
Whoever performs the flushing of this unit should be aware that, unlike external flow centers, flushing can only be done in one direction. From...
"This is my first heating season with geothermal (TT30 closed loop, Stage 1 only)" Why stage 1 only?
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