FAULT
– FINDING
Safety Warning.
The electrical supplies to the heater are potentially lethal. All maintenance and repair
operations should be carried out by trained personnel, supported by appropriate safe systems of work.
Before removing the top cover ensure that, both the main power supply and, the pump interlock supply,
are both isolated.
Excess Temperature Trip.
If all lights are on, apart from the white, amber and green, and the
temperature controller does not engage the heater; this could indicate that the excess temperature
thermostat has tripped. Before resetting investigate why heater has overheated.
Controller Drift.
The calibration of the controller drifts over time, requiring the value set on the dial to be
gradually increased to maintain the same actual temperature in the water. Please contact your heater
supplier to adjust this.
Contactors Frequently Switching.
Switching of the contactors every few minutes indicates that the
direction of water flow could be incorrect. The flow of water is designed to travel from left to right in the
heater. Consult instructions on how to reverse the flow.
Protective Devices on Supply Trip.
If RCD has tripped, first check that other equipment in the
installation has not caused the trip, then check heating elements for insulation resistance. If MCB has
tripped, check it is correctly rated.
Noise.
Excessive “buzzing” when heating indicates small amounts of rust on the pole faces of the
contactor. Electrical contact cleaner should be applied to the affected area.
Pool Not Reaching Desired Temperature.
If the status lamps are lit as described on the previous page
and the contactors can be heard engaging, then the heater can be said to be operating correctly. If the
pool does not reach the required temperature after an appropriate number of hours, then the current
drawn by the heater should be checked using a clip-on ammeter. An alternative method is to set the
temperature control several degrees above normal and use the main supply meter to check how many
Units (kWh) the heater consumes in an hour. This figure should be slightly above the kW rating of the
heater, allowing for the filter pump and other domestic equipment on the same supply. If the consumption
is less than the rating of the heater then the issue is elsewhere in the system, for example:
▪
Low voltage supplied to the heater, indicating that cable diameter is too small or run is too long.
▪
Inadequate mixing of the warm water from the heater with the cooler water in the pool, leading to
a layer of warmer water forming at the height of the inlets. To cure, alter the direction of the pool
inlet jet downwards.
▪
Incorrect setting of any time switches fitted to heater or filter pump.
▪
Time switches are not synchronised with the main electrical supply meter.
▪
Lack of water flow caused by insufficient pump head, or blockages in the pipe-work.
Annual Cleaning
Yearly, before winter, the pool heater should be drained and cleaned. More frequent checks may be
required if pool water contains sediment or any amount of foreign matter.
a) Switch heater OFF.
b) Switch main power supply and pump interlock supply to OFF.
c) Remove main cover and check main and contactor terminals for tightness.
