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My house is one year old with three toilets running into separate stacks ,one short stack at 1.5m and two stacks terminating in the loft ALL fitted with air admittance valves. Its been a while since i did basic plumbing but at present i have no outlet to expel any build up of gas, have the...

If you have no primry filter (should have been fitted at last change )or a clear filter the boiler should run faily quiet (no kettlig) in ch mode. removeing the debri from your old heat ex will help but how do you tell if the scale on the walls of the plate are clear ? its not just flow that...

No your not slow ive just done too many to count mostly in Kevplumb,s patch with all that hard water.

It does require a perm live to the boiler and the only lives to the honywell wiring center must come from the boiler ,in other words the live from the spur goes direct to the boiler and no other lives from the spur if a perm live is also taken to the wiring center it will result in problems at a...

Even worse you cant tell if it has a filter fitted untill you try as the early ones had no filters. Kevplumb just spotted your location ,are you still working around Hartlepool if so who for ?

The instructions from Kevplumb are for the gas/water so no good but as he sugests get a copy of the instructions ,do not do it as you said unless your a masacist , the only way to do the first one is to do it from the book in brief drain down (don't isolate ch bulkhead valves as they will leak...

Paul , any damp in the 24v part of the diverter micro switch will make the relaqys "click" a small weep from the shaft will do it if the 240v side gets damp then the obvious can happen but when a small amount of water shorts the 24 to the 240 then all sorts of strange faults happen. the...

As Tony said you had best switch it off and seek help the flame at the cooker should not alter when the boiler is lit and on full let alone when its trying to light on min

As said its suposed too.

Nevar had to change the pcb driver board on a 240 as ive prob worked on between 500 and a 1000 thats a very good board ( all working 100% ) unless ive overlooked it you have not said how hot it is ? so how can you say its too hot ?

Yes that will do the TRICK .Try looking in the combustion chamber on the top right you find the auto air vent and probably water stains below it ,if it was passing water before ( it evaporates out the flue)it will be full of silicone now so that means you have no vent to let air or steam from.

Yes but later boards flash the ch and dhw lights together so your boiler must be at least 4 year old. You realy need to get someone to put a manometer on the gas valve to check the gas pressures .

prob not the gas valve but will try to explain .pilot flame generates around 30 mili volts at the tip of the thermocoupl (copper lead ) that then travels to the gas valve but not into it , its interupted by a white lead to the high limit stat on top of the gas to water heat ex then back down to...

I your oil tank above the oil pump to start with if not your in for a bit of bother, the test poin you indicated is to atach the pressure gauge to set oil pressure but can be used to vent if you have ran out of oill, hold the brass section solid with say an adjustable spanner then open the nut...

If you have a flow rate of 9ltrs per min you would have to have an inlet temp of 20 deg C as the temp dial on max is 60degC,in other words it wont modulate down at full flow if the dial is on full so would assume you have a gas pressure problem at the meter or the gas valve (check the meter...

If the boiler trys to to fire each time you turn the tap on then the flow switch is ok but min gas presure will give you poor ignition , check the flame when fireing up it should travel from the spark electrodes at the front and accross all the burners to the flame senser at the back in around 1...

horrid rattle is usually the fan bearing gone especially if on hot water as the pump only runs on central heating. The fan does not tend to run slow until it gets to an unbearable din, but the min gas pressure can drift down low ,it should be checked at every service as with all gas boilers ...

The restrictor is on the inlet to the plate heat exchanger at the back of the plate on the connection from the div valve . time your flow rate ie it should fill a 1 gallon / 4.5 ltr bucket in 30 seconds or 1 ltr in 6.6 seconds. To test the gas you will need a corgi card and a manometer or give...

Jiminblack, yes.

The 9 LTR flow restrictor fitted is made up of three parts ,an outer ring an inner ring usually colour coded and a specific size and an "o" ring between them ,the "o" ring can perish and fall away almost doubling the flow rate on the other hand you gas pressure could have dropped. PS no...