potterton EP200 replacement

4 Jul 2011
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United Kingdom
hi guys,i have a old potterton ep200 controller,was looking for replacement and im looking at this.


the problem i have is my old one says EP200,and this one is a replacement for a EP2000/EP2001/EP2002/EP2003,i take it these are the years of manufacture,is there a 0 missing of my controller,or are they completly different.[the control buttons on the new one are very different from the one ive allready got].
see attached pic

Been having some strange issues with the boiler[potterton netaheat,about 16 years old] not coming on at certain times and needs the power to be turned off and back on again to reset.

many thanks
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here is a pic of the one i got


  • IMG_2361.JPG
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Hi gasman,why i think its the programmer that is faulty,where do i start,lately the boiler has not been firing up sometimes ,i have the programmer set,come on 5am,off at 9am,come back on 2pm,off 9pm,both H/W/C/H

Some mornings it would not come on or sometimes it would not come on in the afternoon[for no apparent reason]if i try to override at controls for the boiler to come back on nothing would happen,what i have been doing is turning off all the power to the house,making sure the timers are set to off,turn back on and reset the clock and timers,even if i set it to come on in an hour it will not come back on,i have to set it to come back on in say 4/5 hours and it will fire up,or sometimes it will not fire up to the next cycle in the morning.

Did i say i have an old potterton netaheat that needs a good service.

C/H motorised valve and H/W motorised valve upstairs by the cylinder tank,for some time now the hot water will not come on when asked to by the controller,i have changed the valve and changed 2 motors in the same valve and still will not give hot water when asked to by the controller[its been like this for a good while now],so the little lever on the valve is set to constant,with the thermostat on the cylinder turned down to about 70 degrees.

Does that make any sense


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