The heater's white wire (neutral) connects onto its own separate gray terminal block. Symptoms this part has failed: No power going to the heater even though the red HTR ON L.
Light is lit inside the IQ2020 control box. The heater board is charred on the front and/or the backside. Note: In older control boxes, you may encounter that a chip on this new heater relay board prevents the metal guard from seating properly and it may need to be trimmed.
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This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs". The seller is "oleg_stockus" and is located in this country: US. This item can be shipped to United States.