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Hi Ian, turned out to be the cylinder thermostat. Picked one up from the plumbers merchant this afternoon. Took 10 minutes to fit and I’m back up and running. I really appreciate your help!

I tried the red button on the indirect cut out at the top left of this picture, no reset required. Still struggling to get someone locally!

Thanks Ianmcd Anything else obvious to try? I struggle to get an engineer because I'm semi rural, plus I've not found anyone reliable as yet

Thanks for the reply johnmdc I’ve pressed the reset button on the stat and will see if that’s fixed it. There was no obvious click, just feels dead when I press, but that may be normal? I didn’t say before, but the electric element on my Megaflo cylinder runs off excess solar energy, so as...

Replacement head received and fitted this evening. Fault remains :mad: Could it be that the central heating valve needs replaced? I've just replaced the hot water valve. Anything else obvious I should be checking?

Thanks for the replies. I opened the hot water valve manually when heating was calling, so know there’s no blockage in the valve as water flowed. I have ordered a replacement head and will change at the weekend when I have a chance, so hopefully that will resolve the issue. I’ll post back...

Hi Ian, thanks for the reply. We had Hive installed 4/5 years ago, this is a new issue. I'll look out a "how to" for testing the zone valve and get the head replaced if that turns out to be the issue. PCB may be my fault. I said to him that it had been replaced a couple of times already, so...

Hi Ian, it’s a Potterton Performa System 24 HE

Hi, hoping for some help please. We have an unvented system with Megaflow cylinder, but not getting hot water from the boiler. Heating working fine. We had an engineer out who replaced the diaphragm and then the pcb, but still nothing. He suggested the motorised valve next, but I have no faith...

I was lucky to only need to buy one of the valves and a refurbished PCB. The other valve was left in our attic along with a programmer and a load of solder fittings and a coil of Hepworth pipe when our house was built, presumably by the same plumber who didn't tighten the cable connection at the...

Thanks again picasso, I appreciate your input. Turns out that one of he terminals wasn't screwed down!! After 8.5 years of no problems it decided to stop. Screwing it down and putting it back together seems to have done the trick! Fingers crossed that's it sorted long term. Thanks again.

Ok, now I'm doubting myself! I get a reading close to 0 when connecting my multimeter to the top left and top centre connections, and 1 when I connect top left to top right. Cylinder is cold. So does this confirm its the tank stat?

Hi picasso, just tested the stat with a tank of cold water and power is not flowing, it's just closed. Thanks for your input, I'd assumed that that because there's a stat on the PCB there wouldn't be an additional on the tank - bad assumption. I guess that's why I'm not a heating engineer!

Hi everyone, Hoping for some help please. We have a Potterton Performa System 24 HE with Megaflo tank which has stopped heating water. House built in 2009 and central heating system is therefore 8.5 years old. The programmer has been replaced and is on constant calling for hot water. We have 2x...

Thanks guys for all the input. I think you may have a point. The cable is really thin, maybe less than the 0.5mm2 which the jelly connectors I have used are designed for (telephone cable), so could be that there is a wire which has not been fully stripped to make the connection, but visually...

And that is why you are paid the big bucks! I'll look to source a 5m length of cable which is what is visible in the eaves and cut and replace the visible section. Are phone cable jelly connectors suitable? As I said, there's no chance of getting a solder carried out due to space and...

I was really hoping that wouldn't be the answer! The join appears to be good, so that indicates a problem somewhere else. Not sure how I test it, and really don't want to be paying to get someone out to fix it! I really need to get this fixed over the next week or so before the area is...

Hi John, I had the alarm powered off for 4 weeks while the worst of the work was being carried out, so yes. I reconnected yesterday and it showed the tamper when I powered up again. I thought it may have been because the batteries had discharged, but they will be fully charged again by now. I...

Hi all, We are in the process of getting our attic converted and I had to cut the alarm cable between the main box and the external bell in order to get new trusses installed. I have since rejoined the cable using telephone wire jelly connectors, but I am still showing a tamper to the bell...

Hi guys, the engineer couldn't get out yesterday, but came first thing today with another APS and 20 minutes later the boiler was up and running. Turned out the first guy was useless afterall! I'm delighted to have discovered someone who knows what he's doing! Despite having to make a couple...