Boiler Breakdown Sticky

[Whyme]

worcester 30cdi greenstar if you cant get a good co2 reading ie all over the place its usually the (not sure of the component name) little flap just after the fan, it opens and shuts when the the fans running...

 

[neily01]

Not quite the same but will go with it,poor hw with gled hill 2000 keep pressing sw2 button at the top of pcb until hw temp value is being read. If it reads h85 and the plate is cold then new hw thermistor required.

 

[Whyme]

What's that then? Don't work on valiants much.

normally a pressure sensor fault , they get choked with crap.

 

[neily01]

What's that then? Don't work on valiants much.

Sorry missed that vaillant water pressure switches detect system pressure but also look for a 0.3 bar spike when the pump first kicks in, if it doesn't detect the spike thinks its a pump failure. So if the pumps running but getting f75 it's a blocked up pressure sensor. Bad position on the old models bottom left now top left on the new models.

 

[Ollieg]

Gledhill System mate 3 with no hot water. Check the make up tank has enough water in it.
A lot of people miss this.

 

[R1CKY]

Ahh Gledhill! If you are ever unfortunate to come across a Gledhill Gulfstream, turn around and walk away! I'd rather try and resolve the North Korea crisis that work on one of those abortions!

DHW diaphragm on a Gionnani diverter valve not making contact with the microswitch, bit of plumbers mait and a 5p coin stuck to the top hat on the pin works as great temporary fix until you can make a permanent repair.

Heatline Vizo and similar. Hot water not working will most likely be caused by the diverter cartridge leaking into the motor. Turn the power off at the mains before you touch it, as they can blow fuses on the board, sometime the board itself, when they are moved with water in them.

 

[neily01]

Glowworm flexcons flow flexi bottom left hand side start leaking when the crimp clips start to get loose. Replacement flexies have jubilee clips rather than crimp clips

 

[Dotty]

Sorry missed that vaillant water pressure switches detect system pressure but also look for a 0.3 bar spike when the pump first kicks in, if it doesn't detect the spike thinks its a pump failure. So if the pumps running but getting f75 it's a blocked up pressure sensor. Bad position on the old models bottom left now top left on the new models.

Changing one of these on Monday. Vaillant also say there is a filter that can be accessed and cleaned if you remove the rubber flow hose.

 

[Whyme]

Changing one of these on Monday. Vaillant also say there is a filter that can be accessed and cleaned if you remove the rubber flow hose.

if its an old one the part will be on the bottom left in the brass block "rubber hose type". ifs its newer it will be behind the air exhaust to the left just before the pipe goes into the main heat ex " copper connections no rubber hoses"...its a black part that has a little pin plug attached..if you undo the rubber flow hose then make sure youve got a jubilee clip to make good after. (just crunch the hoses croppie to get rid of the crap around the system).

 

[Ollieg]

Glowworm ci. flexi hose to expansion vessel becomes kinked/blocked. Can usually fixed by giving a gentle squeeze with grips. PITA to replace.