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not sure why some think its anything to do with gas valve etc , dhw ok , flashing c on ch call but not firing and not going to lock out is always divertor on isar, boiler thinks its up to temp due to being in dhw mode on divertor

go with the smallest boiler that will do the job , keep it turned up on high , dont go too big , remember any boiler more than 60,000 btu will need 28mm flow and return , so if you go big with 22mm pipework you will have turn down anyway as the heat will not leave boiler as fast as required ...

if the boiler is poor on both ch and dhw more likely to be divertor faulty in boiler , easy to check , make sure boiler and heating are cold - been off for a while and a hot tap has not been run for a while , everything cold , then put your hand on ch flow pipe just under boiler - 22mm pipe ...

hi , i am a gas fitter for a large company and work on about 4 to 8 boilers a day , firstly what a terrible place 4 a flue , i have come across flues like this before in bathrooms and checked with gas safe and is legal which is amazing just hope the boiler casing never gets a live wire touching...

NITROMORS PAINT REMOVER ,OR BRUSH RESTORER WHICH IS A WEEK NITROMORS MIX , OR GRAFITTI REMOVER PLUS A PRESSURE WASHER WILL SHIFT IT , THEN IF YOU WANT AN EVEN SHADE ALL OVER AGAIN - CLEAN THE WHOLE LOT WITH WATERED DOWN BRICK ACID AND WASH OFF , TONY

:lol:

1 yes ok to turn fitting 2 no they dont stock the grey hep2o , just the new white which is not selling well because plumbers dont like them , you can re-use what u have ,but means sliding the grab ring so u dont bend the teeth the wrong way but not worth the risk or hassle , just buy polyplumb...

check the pressure in the expansion vessel using a tyre gauge , you can also usually tell when they need replacing because the pressure will shoot up a lot quicker than usual when topping up , also when your father put too much pressure in bolier the prv opened , prvs are shut all the time so...

no , just finger tight is fine , i work on ideal boilers all day , pain when people make them tight with a spanner , new ideal models such the logic have a larger plastic nut now

can not believe you are asking this question ,also do you really need to put a gas test on for one joint - use you gas leak spray - what ptfe are you using or what are doing with it - never had a leak on a job like this using ptfe , in fact it has took me longer to write this than it should take...