Watkins, Caldera, Hot Spring, Tiger River, Hot Spot Spas.

This heater relay board retrofits into IQ-2020 controls. Item# 74618 (old part number) is replacement option for 73355

What is included: New Upgraded IQ 2020 Heater Relay Board w/ Jumpers & Shortened Screws for the front cover of the IQ2020

Description: This IQ2020 Heater Relay Circuit Board is the newest revision for the 2001-2008 IQ2020 Control Box. It’s upgraded design provides a more efficient method of connecting the heater’s power cord to this board. The black wire from the heater’s power cord now connects into the H1 position on the large gray terminal block. The heater’s white wire (neutral) connects onto its own separate gray terminal block. This will reduce stress on the relays and increase their lifespan due to better transfer of voltage. The ground wire connection remains the same. This upgraded circuit board replaces the first and second generation boards in the IQ 2020 Control Box found in all 2001-2008 Hot Spring and Tiger River spa models.

Symptoms this part has failed:

• No power going to the heater even though the red HTR ON L.E.D. light is lit inside the IQ2020 control box.
• The heater board is charred on the front and/or the backside. Caldera, Hot Springs and Tiger River Heater Relay Circuit Board 74618

Description: Heater Relay Board with Jumpers and Shortened Screws for The Front Cover

Used on: Caldera, Hot Springs, Tiger River and Lime Light Spas Known As: Watkins 74618 Hot Springs 74618 Caldera 74618 Tiger River 74618 Lime Light 74618 Watkins 73357 Caldera 73357 Hot Springs 73357