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Tested the voltage at the mod coil,removed wires from coil and opened tap full voltage was 34 volts.what seemed strange was that the dwh was still hot at half bore and dropping off fully open with the wires disconnected.Ran for a period of time but didn't go into low flame,is this maybe because...

When the dhw is flowing approx 4 litres/min the temp on the primary flow and return to the water to water heat exchanger is too hot to touch for any length of time.When the flow is at 9 litres/min the inlet and outlet are luke warm.why would the temp on the primary flow and return on a closed...

The fact that the timeings for the gas rate are not correct in override,how would the heat exchanger being scaled up influence this. ps ive already checked the resistance,and changed the thermisters.

Thanks for all the advice, ill get someone in and let you know the result.

Just to check last test,when i put the test switch on max the boiler fired up the central heating light came on,[ is this normal] then i opened the hot water tap fully,the time was still 92 secs.Am i correct in thinking that the switch overrides any modulateing output from the board thus...

With the hot water tap open full bore,it took 96 seconds for 1cu ft.

The flow rate checks out ok,1ltr in 6seconds.The gas meter is not digital,so l assume it is dials and is measured in cubic feet .How would l measure the rate.

Thanks for the advice,is the restrictor on the outlet pipe from the water to water heat exchanger.If its not the restrictor does that mean the gas valve pressure needs adjusting or is the gas valve faulty?

its just started doing it +++++++++++++++++++++++++++++++++++++++ No its just started doing it.Could it be anything to do with any of the thermisters. ++++++++++++++++++++++++++++++++++++++++ The boiler has worked ok for the last five years,its just started doing it...

I have a problem with the hot water demand on my boiler,when the tap is open half bore the temperature is ok but when I open the tap full bore the temperature starts to drop off, any ideas.the central heating is working ok MOD please see 1a

Hope someone can help,l have a problem with my boiler,its a bosch worcester 24 cdi bf.The central heating works ok.When l open the tap for hot water about half way the teperature is ok,but when l open it full bore the temperature drops off .Any ideas!