Until a week ago,my HW and CH system was controlled using a Potterton EP3000 programmer. The system is a relatively simple one consisting of boiler/pump/roomstat/2xmotorised valves and an indirect fed HW cylinder with stat.
The EP3000 went u/s due to the LCD screen failing,so on taking advice from a plumbers merchant i purchased an EP3002 programmer,as this was a "direct replacement"...ie no wiring changes etc to the original backplate.
On fitting the EP3002,i set the rear switch to 10 programmes,(in line with the old EP3000), and set the HW/CH programmes to come on at 5-30 to 7-30 AM and 4-00 to 10-30 PM. However, what has happened since fitment has puzzled me!!
At the start of each HW/CH cycle the programmer starts as normal,with the indicator lights illuminating as reqd etc.and everything in the system apparently working as it should.
However at the end of each cycle something "odd" happens!!. At 7-30 AM the programmers lights extinguish as if the system has shut down,but the pump,(and consequently the boiler),continue to run/fire up for a period of approximately 8 minutes...then the system shuts down as required.
This then happens again on the PM programme,where the system begins as normal at 4-00 PM but at 10-30 PM when it is due to shut down,the pump and boiler continue to operate for approximately 12 minutes,despite the programmer lights being out!!.
I have checked,re-checked the programmer timings and can find nothing wrong with these setting.......Can anyone advise me as to wether this new programmer is faulty,or if the wiring on the backplate did need altering??
Many thanks
The EP3000 went u/s due to the LCD screen failing,so on taking advice from a plumbers merchant i purchased an EP3002 programmer,as this was a "direct replacement"...ie no wiring changes etc to the original backplate.
On fitting the EP3002,i set the rear switch to 10 programmes,(in line with the old EP3000), and set the HW/CH programmes to come on at 5-30 to 7-30 AM and 4-00 to 10-30 PM. However, what has happened since fitment has puzzled me!!
At the start of each HW/CH cycle the programmer starts as normal,with the indicator lights illuminating as reqd etc.and everything in the system apparently working as it should.
However at the end of each cycle something "odd" happens!!. At 7-30 AM the programmers lights extinguish as if the system has shut down,but the pump,(and consequently the boiler),continue to run/fire up for a period of approximately 8 minutes...then the system shuts down as required.
This then happens again on the PM programme,where the system begins as normal at 4-00 PM but at 10-30 PM when it is due to shut down,the pump and boiler continue to operate for approximately 12 minutes,despite the programmer lights being out!!.
I have checked,re-checked the programmer timings and can find nothing wrong with these setting.......Can anyone advise me as to wether this new programmer is faulty,or if the wiring on the backplate did need altering??
Many thanks
