SV Mini Heater Replacement Guide
RISK OF ELECTRIC SHOCK – Ensure mains power is turned OFF at both the isolator switch and circuit breaker / RCD.
Repairs must be carried out by a qualified technician.
2. Disconnect the 240V heater wires from the heater terminal block on the PCB. Then reconnect the new heater wires, ensuring all terminals are tight and securely fastened using a handheld screwdriver.
***DO NOT use an impact driver or high powered drill as this can strip the screws and damage the PCB***
3. Disconnect the old sensor cable from the heater RJ socket on the PCB. Reconnect the new heater sensor to the heater socket, ensuring the cable is routed downward through the bottom groove.
4. Close the shut off valves on each side of the heater tube to isolate the water supply. Then loosen the unions on both sides of the heater tube so it can be removed. Install the new heater tube and tighten unions. Ensure the heater is mounted horizontally so the heater sensor is located at the top of the heater tube. Now, open one shut off valve and loosen a union to bleed any air from the system. Once the water coming from the union is at a steady trickle, tighten it back up and open the other shut off valve.
5. The heater MUST be installed on a level horizontal plane only.
The heater CANNOT be laid on its side or on an angle. It must be orientated as pictured to ensure correct operation of the optical water sensor and thermal cut outs.
Heaters installed in an incorrect orientation will not be covered by the SpaNET product warranty.
6. When installed in a spa using a low flow circulation pump, we recommend tilting the heater to have the sensor side slightly higher. This will ensure the entire element is submerged in water before the sensor is, negating the chance of dry firing the element.
