New board fitted after speaking with worcestor tech help line . Boiler fired up ok . next day after the boiler had been on a while and heated up the house the fault light started to flash . Pressed reset and boiler fired up . This then happened a second time .
Original fault was the fault light was flashing 4 times per second , the boiler would fire up the fan would start then slow down and then stop . There was only 110volts from the board to the fan , this was why the technical helpline said that it was a board fault .
Prior to writing the above fault I had asked the owner to turn the boiler temp controller , for the heating side, down just a fraction . I was phoned this morning to tell me that the boiler had stayed on allnight with no fault light . After consulting with the plumber who fitted the system it appears that there might not be a room stat ,
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your boiler needs a minimum gas pressure of 16 mb to light successfully. if your gas pipe has been extended it has to be able to flow enough gas. it may need upgrading to 28mm for even as little as a metre from the gas meter. if your central heating works ok when the fire is off then this is your problem
Try bleeding the gas line to the valve. They are always full of air after a valve replacement. BE CAREFUL!!!!!!!!!!!! Gas is explosive!!!! Does the valve "click" when the stat calls for heat? If not, check the wiring.
It not wired in right that why its coming on when it is off The boiler is over riding the programmer when it is off .
The boiler should call for heat if programme is on it sounds like boiler is wired into the 24hr mode or over ride mode that why it is coming on . google wiring for y plan heating system. this will help you fault find on this . changing vales and thermostats will not help you . Hope this helps .
If you are using more than one heat source you will have 1 more pump than the heat source pumps
Main pump = SYSTEM pump pumps through the indirect hot water system and back into itself. This is the system loop.
The other two boilers tee into this loop upstream of the indirect tank, downstream of the SYSTEM pump.
The cold water return to each boiler tees into the system loop next to and upstream of where the hot water for that boiler tees into the system the loop.
The oil boiler will have its own pump on its return line from the sytem loop and the solid fuel boiler will have its own pump. When any boiler fires, it turns on its own pump AND the system pump.
If you want a drawing email me -firstname.lastname@example.org send a fax number and I'll fax you a drawing.
first off ensure water is getting to boiler, next, No pilot = pressure switch. On my baxi solo 40 pf pressure switch is replaced 8-10 times a year cures your problems,,,,,,,, momentarily , and have had all your other parts,but with no effect to speak of,.......sorry............ solution = [ change boiler ].sounds like gas pressure or lack of water to system or **** boiler like mine .........good luck.
back boiler run from a gas fire? check the instructions to operate the gas heat to the back boiler not just the fire I presume that this a fully pumped system - air lock doubtful There maybe on/off valves on the pipes to and from the back boiler [situate close to cylinder] make sure they are on - anticlockwise turn or there could be a blockage in the outlet from header tank usually in the loft. or If there is no water in it maybe the mains cold feed it is off. Note if no water in it DO NOT USE the back boiler
vailant boilers are one of the best on the market and should last you more than 6 years depending on installation and servicing.
the engineer you had should not have replaced the diverter valve if the boiler was firing up when the taps are opened. if you was getting luke warm water with the boiler alight it is a classic symptom of a blocked plate heat exchanger on the central heating side.
a new heat exchanger can cost around £100 depending on the age and model of the boiler.alteranatively it could be descaled but may clogg again. it would be a good ideal to fit a magna clean filter on the system to help prevent further debris if you have a dirty system .if you don't trust your engineer i suggest you ask another. find out if he is registered first and don't pay until you are satisfied with the work. if you are asking the same engineer back try and get a discount off the work as he has failed to rectifiy the original fault and fitted the wrong part due to wrong diagnostics. if he is registered you can complain to the governing body ie corgi or gas safe register.