I have an Ideal Mini C24 (which i believe is the same as a Biasi M90) and had the diaghram replaced today by a reliable heating engineer. The heating wouldn't come on unless you turned a hot tap on!
I was at work when the work was done, but when i got home, the house was nice and warm. When the timer clicked to turn the heating back on at tea time, nothing. Turned the hot tap on, nothing. Great. No heating OR water now!. I had a look at the boiler, removed the microswitch and turned the hot tap on. The pin that is pushed out by the diaghram is being pushed out, but very slowly. By the time it has come out enough to push the switch, the boiler has tripped. What I can do though is turn the hot tap on, and before the boiler trips, activate the switch by pressing it with a small screwdriver, firing the boiler which gives me hot water. If i leave the screwdriver activating the switch for 10- 20 seconds, i can then rehouse the switch as the pin is far enough out to keep the switch pressed in (hope that makes sense). The same is true for the central heating. So the diaghram will push the pin out far enough, it just does it too slowly, so the boiler trips before contact is made.
Could this be a hole in the new diaghram, or am i completely barking up the wrong tree?
(btw i'm waiting for the guy to call me back, i'm just curious)
I was at work when the work was done, but when i got home, the house was nice and warm. When the timer clicked to turn the heating back on at tea time, nothing. Turned the hot tap on, nothing. Great. No heating OR water now!. I had a look at the boiler, removed the microswitch and turned the hot tap on. The pin that is pushed out by the diaghram is being pushed out, but very slowly. By the time it has come out enough to push the switch, the boiler has tripped. What I can do though is turn the hot tap on, and before the boiler trips, activate the switch by pressing it with a small screwdriver, firing the boiler which gives me hot water. If i leave the screwdriver activating the switch for 10- 20 seconds, i can then rehouse the switch as the pin is far enough out to keep the switch pressed in (hope that makes sense). The same is true for the central heating. So the diaghram will push the pin out far enough, it just does it too slowly, so the boiler trips before contact is made.
Could this be a hole in the new diaghram, or am i completely barking up the wrong tree?
(btw i'm waiting for the guy to call me back, i'm just curious)