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Don't matter what battery as long as it's giving a sufficient voltage and yours is.

In all honesty the best thing now is to send the control switch to me and let me test it?

think you may have a problem with damp there ...lol.

you can get a good damp detector on line.

i am having the same trouble with the carver cascade.

the water pump is constantly running and the green and yellow lights are on, i have a new battery so i dont think its that. can anyone help pls!! : ) 

contact gary or see if this helps/  

http://www.arcsystems.biz/

Operating Instructions               1) BEFORE SWITCHING ON make sure that water flows from the hot taps. This indicates that the water heater is full. Check that the gas and electrical supplies have been connected and turned on.
2) SWITCH THE WATER HEATER ON at the wall switch. The green light will come on and remain on. THE GREEN LIGHT indicates that the heater is operating satisfactorily and does not refer directly to the burner operation.
3) THE YELLOW AND GREEN LIGHTS on together show that the voltage of the power supply to the heater is too low. The heater is automatically switched off until the voltage is high enough.
4) THE RED AND GREEN LIGHTS on together show that the burner has failed to light in the 10 second ignition period. This is usually due to failure of the gas supply or, in the case of a new installation, air in the gas pipes. Switch off and on again, which resets the controller and initiates a new ignition sequence. To clear air from the gas lines, several repetitions may be required.
5) TEMPERATURE AND ADJUSTMENTS. The heater is supplied with the thermostat set at maximum (approx 68°C). If the water at the taps is hotter that you want, the temperature may be adjusted as follows:-
a) Switch off heater at the controller and allow to cool for at least 10 minutes.
b) Remove cowl from outside of caravan (4 cross head screws).
c) Lift the flap and turn toothed wheel inside it. Each tooth is about 1 ½ °C.
d) Replace the cowl, making sure it locates firmly on the square aluminium flue nose. Switch on and check temperature after about ½ hour.

This can not be done on newer modles.

thanx!!

but what and where is the control switch?

we fited a  new pump last month because the old one wasnt working.