The Watkins 77119 is the correct OEM Heater Relay Circuit Board for all Hot Spring / Tiger River / Limelight / Caldera spas using the IQ2020 control system from 2001–2009.5.
This board is responsible for switching power to the heater in IQ2020 systems. It contains:
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Two heavy‑duty heater relays
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Heater terminal block
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Ribbon‑cable interface to the main board
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Upgraded solder joints (fixes the common burn‑out issue)
When this board fails, you typically see:
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Spa won’t heat
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Heater light flickers or never comes on
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Burn marks on the relay solder pads
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GFCI trips when heater engages
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“Heater disconnected” or “No heat” symptoms
Replacing 77119 resolves these issues without replacing the entire IQ2020 control box.
