User Guide

Activity A | Thermistors Replacement

Each heater is equipped with 1 outlet thermistor (see image above). It is located on the hot water side (Left

side of the unit) red wire. The function of the thermistors is to measure the outgoing water temperature

and display it on the LED located on the front of the unit. If the thermistors fail, the LED display an E1 error

code, if your unit is displaying an E1 error code, you will need to replace this sensor in order for the unit to

function correctly. Please follow the below steps to install the new thermistor.

1. Turn OFF breaker

a. Once breaker is off, turn round knob to ensure no power is at the unit.

LED display will not light up if the correct breaker is off.

b. If LED display does illuminate, the correct breaker was not turned off.

2. Unscrew front cover of unit. You will notice a “Warranty Void if Seal Broken” sticker, disregard this.

a. Warranty will not be voided. This sticker is there for safety purposes to ensure customers

contact technical support before opening the unit.

3. Locate the outlet thermistor (red wire) on the left hand side of the unit.

a. See above image.

4. Once you have Locate thermistor, follow the red wire back to the control board and unplug.

a. The thermistor wire are quick-connect style. To disconnect, gently pull on wires until unplugged.

b. Next unscrew the thermistor from the tank. We recommend you uses a pair of pliers to do so.

5. Install new thermistor

a. Make sure you place the O-ring on the hexogen nut on the head of the thermistor before

screwing down your new thermistor.

b. Plug in the male connector to the Red female connection located on the control board (Red

connection).

c. Turn breaker ON.

6. Run water

a. Turn on the hot water tap for approximately 45/60 seconds. During this time, the unit should

begin to heat water.

b. Make sure LED display is illuminated on heater.

i. If it is not, check that the correct breaker was turned on.

Outlet thermistor

Thermistor Connection