FAULT FINDING
WARNING: BEFORE COMMENCING OR COMPLETING ANY ELECTRICAL WORK ON THE APPLIANCE, IT IS
RECOMMENDED THAT THE BASIC SAFETY CHECKS FOR EARTH CONTINUITY, SHORT CIRCUIT, POLAR-
ITY AND RESISTANCE TO EARTH ARE MADE. ALL WORK CARRIED OUT SHOULD FOLLOW GUIDELINES
LAID DOWN BY THE I.E.E.
Operation
The Heater requires Mains on both the Live (L) and Switched Live (SL) connection to be able to run. It is delivered
with a link between them which can be removed if a separate Heater switched live is going to be used.
To run, the Heater must have a Mains supply, Gas, Pool Pump pressure sufficient to activate the Pressure Switch,
all safety switches closed and a pool temperature below the set point.
If all the above are correct then the Gas Ignition Control starts the Ignition sequence:
1. The Fan runs as a pre-purge of the Heat Exchanger
2. After a few seconds a spark is created at the electrode and the burner is lit.
3. The burner flame is sensed and the spark is removed.
4. The Fan speed is then changed to the required speed according to the modulation curve.
5. If it fails to light the burner the spark will stop and the Fan will run on as a post-purge of the Heat Exchanger.
6. The ignition sequence will be repeated up to five times, then the control will lockout and will require
a reset to start again.
Safety Controls & Lockouts
The Pool Thermostat Control indicates the actual and set temperature of the pool and also displays all the
lockouts. The next pages detail the fault conditions, the indicators, the display and the actions required.
Setup Mode
Turn off on the Panel Switch. Turn on with the Panel Switch whilst pressing the Lock/Reset Button.
The Control is now in Setup Mode. See Page 16 for details.
Engineering Mode
This is a special mode used to set the operation of the Control and to investigate fault conditions, it requires a
Special Connector available from your supplier. It is recommended that none of the settings are altered without
consultation with the manufacturer.
Turn the Heater OFF with Panel Switch
Remove the Front Top Panel and the Electrical Chassis Cover.
Pull off the PCB connector for the Sensors and replace with the Special Connector.
Turn the Heater back ON.
It is now possible to change some of the Control’s parameters. Press the Lock/Reset button to display
them. To show the alternative, rotate the Pool Thermostat Potentiometer
1. bt1 or bt3. The Control Heater personality. bt1 are traditional non-condensing Pool Heaters,
bt3 is the Condensing Pool Heater. Default is bt3.
2. td0 and td1. The Test Temperature Display Mode. Default is td0. td1 is a special diagnostic mode
which shows all the sensor temperatures to one decimal place, for each press of the Lock/Reset
button.
3. 0.0 to 7.9. Proportional band. Default 1.0.
4. 0 to 50. DeltaT modulation point. Default 12.
After making the selections required, power off, replace sensor connector and power back on.
Test Temperature Display Mode 1 (td1).
Temperatures are displayed to 0.1 degree resolution, not the normal 1 degree.
The display will now show each sensor temperature and cycle around them for each press of the Lock/Reset
button.
1. Pool Temperature as normally displayed.. The Green LED will be alight.
2. Pool Temperature is dispayed to 0.1 degrees. The Green LED will be alight.
3. Heat Exchanger Flow Temperature. The Yellow LED will flash rapidly.
4. Heat Exchanger Combustion Temperature. The Red LED will flash rapidly.
Rotating the potentiometer will change the set temperature. Pressing and holding the button whilst one of the
temperatures is displayed will ‘lock/unlock’ it on the display for continuous observation.
Condensing Pool Heater 20 14/11/06
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