HWH, system ?
Do you know where the pump and reservoir are located?
If you can get to the pump motor , you'll find a relay mounted to it , you need to test the relay, and the motor.
Voltage to one large terminal on the relay should go through the relay to the motor when the leveling button are pushed.
If your system is HWH , and you don't have a manual , they are downloadable from the web site.
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