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The 50b does have an interrupter (limit stat) it may not be a part of the thermocouple itself but still sits in series with the thermocouple before the final gas valve connection, often found the interrupter thermocouple replaced with the std type thermocouple and elmwood limit stat as its...

The heating bulk head valves ALLWAYS leak when you shut them off and on so drain down the whole sytem as changeing those valve a s.. of a job

If its RSF then you have two overhat stats under the controll box ,the one on the left is for the slave tank (hot water) and the one on the right is for primary temp, if you look from under the dials you should see them . press the center of the button if you feel resistanse push against it and...

Hot on the left and cold on the right, all mixers showers etc supplied as such.

Your sick ! I spend my days following bodje it and scarper,I do get a good laugh when i read the benchmark books with things such as the flow rate at 12.3 lt on aboiler that has a 10 lt restrictor,obviously just copied from the book and burner pressures recorded on boilers with no gas test...

Leaving the ch dial on max is wrong unless your house needs the full output of the boiler the most economic position is off (but a bit cold) if you slowley raise it day by day till its comfy to find an ideal position.

What the heck is an advance light on a CDI. You have a power on ,ch demand and dhw demand lights on the facia and a demand light on the digiatal timer ,so what do you meen by an advance light ?

Could be you have poor quality trv's the bi directional ones that BG originaly fitted were pants.

If you look on the back of the front panel you will find the instructions for filling (assuming your on a sealed system as the cdi is available open vented). If the boiler has overheated you should have two flashing lights ?

The only thing that will stop you getting a ch demand is a faulty programmer or room stat depending on what type fitted , if its the internal digital timer unplug it from the board then it should leave the ch on constant if the room stat or link is closed,never had a board give that problem...

Have things changed ? can you fit a Myson fire on a Baxi back boiler , surely it has to be a Baxi fire front ? :shock:

Sounds as if its overheating but the primary stat or limit stat should have kicked in on a worcester ? the next thing is system contamination usually too much inhibitor and cleaning solution still in the system .The boiling temp is lowered so the water gases up and the pressure gage bounces...

If your boiler is 5 years old then it will have the old junkers gas valve,it does have a habit of min gas pressure dropping ,thats not a problem if its serviced properly. Get your service eng to set the min gas to 1.0mb and check the flame sensor it should have between 5 and 8 micro volts in...

Good point about the syphon drying out , allthough the green star has a trap before the syphon ,thats why an aditional trap in the line with no air inlet can stop it running (too much resistance), if he has the txt display and tr2 then he will have pre heat for the water to water ,that should...

If it does have a vertical flue kit available contact the large merchants they can do a nationwide search on the computer and see if a branch has an old one still in stock.

I work on Worcesters all the time and the Greenstar range is spot on but i would stay clear of the 26 its a conventional cdi turned into a condenser with an extra heat ex fitted,not that good.

Nothing available from Bosch to go on the flue terminal and you cant fit anything not aproved by the manafacture but the greenstar has a lot of flueing options at 100mm dia and more if you go up to 125mm dia, basicaly the flue can go upto around 15m high depending on the model. You can only fit...

Air pressure switch is around £17 but have the min gas pressure tested it can drift low on min gas the (when ch first on) it should be about the size of a low cig lighter if its very small and takes more than 6 second to light then it prob reqires seting.Worcester caharge £175.44 to fix with 3...

24i does not have a diverter valve but it does have a flow switch but that would not acount for the lack of CH .The week links on a 24 are the air pressure switch and the pcb, if you have one of the original dark brown air pressure switches replace it with the new white Huba switch, wireing...

Noise could be coming from your diverter valve on the system, find the position of the valve (often near the cylinder) and place your hand on it to see if it shudders when its activated.