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We went away on holiday during September and since we've been back the heating has been on for most of the time so the Mrs hasn't complained much about the boiler.... until today. The problem has become repeatble, but instead of locking out, we get HOT/COLD/HOT water in approx 5 second...

I think I've been able to establish that it's not the switch (pity, would have been an easy fix). I guess I'll have to drain down the system to check the rest, so I'll have to leave that until at least the weekend. Thanks for your help so far. Fingers crossed.

It's been a little while (about 1/2 hour) since I last did the previous test and the pin has gone back in. I just repeated the hot water test and now when I turn the hot water on and off, the pin seems to be going in and out quicker that before (not sure if I was imaging it) and the hot...

When I first took the microswitch off the pin was retracted. When I turned the hot water on, the the pin came out. When I turned the hot water off, the pin went back in. I did this a few times and without the switch mounted, the boiler locked out (after turning the water off for the first...

(Not trying to sound cocky) A few years ago I was able to diagnose and fix a problem with a split diagram and faulty dhw microswitch (on separate occaisons but before this problem). Sometime ago (when this problem started) I thought it was an issue with either one of the thermistors around...

Hi, I have a Glowworm Compact 100e and am having an intermittent problem with the hot water. Every now and then (actually most of the time) the boiler locks out and the red LED comes on. This happens when I turn on a hot water tap while set to the Summer setting (i.e. CH is switched off). It...