Recent content by ianfoskett

the fan only comes on when you blow into the pressure switch then the boiler lights. but wont come on when you first turnon boiler or it cycles. could this be a pressure switch problem. old worcester 9.24

on my worcester 9.24 the fan wont come on when you first switch it on, when you blow in the pressure switch the fan comes on and the boiler lights. it runs for about 10 mins or so then the fan goes off so does the boiler. and then wont relight for about 15 mins doing the same thing of blowing...

any advice please. boiler when it does light only stays lit for about 3 or 4 mins they gas goes out. when trying to relight it you can see the spark and some times it relights briefly before going out. i have checked most things. i dont think its the over heat stat as its not reaching anywhere...

is your hot water cyclinder there to.

is your pump within the boiler housing, have you checked for any exposed frozen pipes. if the boiler goes to over heat lock out, it can only mean the water in the boiler isnt going anywhere when heating is on.

it would suggest the pump isnt working.

control stat ok. turns boiler of when turned down and switches boiler on again when turned up. fan and pump come on but no ignition.

checked pcb

boiler fires up runs for alittle while then cycles off, it then wont relight, changed electrode and tried anew solenoid, pump works and the fan comes on. pressure is ok. it just seems to work as and when. any idears.

put your 10mm pipes inside copper pipes instead of plastic, and make sure you dont have any joins that you cant get to.

if your boiler keeps cycling like this its posible that your pump might have failed, which means that the water the boiler is heating up is only working on gravity circulation.

i dont think it would help leaving cold tap on,as it would need to be on quite alot to prevent freezing. if you have a sealed system, are you finding that you have to top up the system or is the boiler decharging water from the pipe outside. this would suggest a problem with the diverter valve...

yes you should have about a 20 degree drop on condensing boilers, but if you haven't put in larger rads you might not get enough heat out to heat the room.

the rad with two pipes going into, if im right in thinking have only a white + and - knob on them, and if im not mistaken are microbore as well. which would lead me to suspect that your problem is sludge related. if you were venting the radiators alot then thats a big sign that you have a build...

if you have microbore upstairs [small pipes] and 15mm downstairs, if not balanced properly the water will take the route of least resistance. you should have a 10 degree drop from flow to return on the radiators with the 15mm pipes, which is only a very slight opening of the lockshield valve...