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The F & E cistern in the loft is good & has ample water. The cold feed to the radiators is good. I've cleaned & flushed the system out with Sentinel X800 & refilled & bleed the system. No change. It's still cutting out after 3 minutes & all three lights were out on the PCB housing & the reset...

For the short amount of time the boiler is running, A few radiators are getting Luke warm. The circulation doesn’t seem to be as efficient as it has in the past, Yesterday I stripped out & cleaned the pump. It was running.

Thanks for the swift reply. When you say a Jammed/faulty pump. Do you mean the one located upstairs in the cupboard with the hot water cylinder? I've checked that pump & the pipes either side of the pump are hot.

I’ve got a Potterton 12SL Promax condensing CH boiler, It would be great if someone could give me some advice to resolve this problem, I was having problems with the boiler where I was getting the Dry-Fire warning lights on the fault finding. I’ve recently changed out the flow switch as well...

Thanks

So change the mid position actuator out?

I appreciate I’ve only temporarily solved the symptoms & not necessarily the cause. What’s your advice on a permanent fix?

Thanks for the advice, that’s done the trick. 5 minutes after turning the power back on the boiler fired up. I’ve tested it on the thermostat, manually & automatically on the controller. Thank you very much for your swift advice, guys. It’s done the trick.

I’ve turned the power back onto the controller after 5 minutes & no improvement. No power to the boiler. When I turned the power off the 3 way valve went to Water-W & when I switched it back on it returned to Heating-H.

Thanks, I’ve turned the power off to the controller & it’s powered down. I’ll give that 5 minutes.

Here’s a few photos of the controller, which is showing the CH & HW is on. Also the room thermostat & some of the boiler cover & cover off. The controller is on but no lights to the boiler in the garage. Thanks

Thanks for your swift reply, Chris. Hopefully these photos help. It’s a a 3 way valve.

Hi, I’m seeking some advice on a problem that’s occurred with my Potterton Promax 12 SL boiler, the problem is intermittent. It comes on in the morning for a few hours. Then when it’s up to temperature it goes off & won’t come back on till the next day. It doesn’t come on in the evening or for a...