Range Tribune Combi Boiler Not Heating Water / Rads - HELP!

Sharons1987

Sharons1987 said:

Hi there 

just wanted to update! A new engineer and £530 later 😭 a whole ton of things were replaced - 2 x valve actuators, expansion vessel which failed, PRV which failed, strainer (which it turned out had been removed and never put back in - no wonder the heat exchanger was filthy) and all tested and working! 

But I have two weird happenings now... wondering if normal ?? Really don’t have any more money left now to get someone in again so hoping some can help

1. Eng advised all working fine but question re the water temp - is it overheating if the water temp is super hot (53c with meat thermometer) despite the cylinder thermostat set to only 45? 

2. What does the click on the cylinder thermostat mean /do? I ask as it was set to 45 by eng as it clicked there ... all fine until today put the CH on not on timed just on/on ... all powered up and valves opened but no heat to rads, moved the cylinder thermostat which clicked in at 55 abs then heat came through!?
3. Have strange thing where If I leave all off for say a day as don’t need heat, there is weeping from this part just above the bypass valve? This only happens when left off... why might this be? Now I’m a situ where I’ve spent £1100 and am still afraid to have on in case overheating and off in case it leaks (the drip is also right above the fuse box so a bit terrifying)

any thoughts / help very welcome @tlTallerdave @Mister_G

Sorry mistagged - @Tallerdave

Tallerdave

If you wind the tank thermostat down, the water should only be heated to a lower temperature.  They're really basic engineering,  hence the inaccuracy.  There's also built in hysteresis which is why you had to turn it up quite a bit to get it to "click" on. This prevents the system toggling on & off incessantly trying to maintain the temp at exactly the set temperature. (That said,  setting the programmer for an hour or two in the morning is all you need. So all normal. 

The fact that the radiators didn't get warm until you cranked up the tank 'stat sets alarm bells ringing!  HW and CH should be able to independently call for heat. So that does need investigating, as does the slight leak. 

Sharons1987

Tallerdave said:

If you wind the tank thermostat down, the water should only be heated to a lower temperature.  They're really basic engineering,  hence the inaccuracy.  There's also built in hysteresis which is why you had to turn it up quite a bit to get it to "click" on. This prevents the system toggling on & off incessantly trying to maintain the temp at exactly the set temperature. (That said,  setting the programmer for an hour or two in the morning is all you need. So all normal. 

The fact that the radiators didn't get warm until you cranked up the tank 'stat sets alarm bells ringing!  HW and CH should be able to independently call for heat. So that does need investigating, as does the slight leak. 

Superstar thank you - so in terms of that click just leave it where is and stop fiddling? He had set it at 45 should it be higher? I see all this talk of 60/ legionnaires! 

In terms of calling for heat it’s strange, the boiler does fire up the actuator opens up etc and it makes all the right noises but just nothing comes through to rads - any ideas where the fault might lie or too hard to say?