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I nearly forgot I have arranged for a Corgi man (friend of a friend) to call tonight to prove the integrity of the combustion chamber as recommended in an earlier posting.

I received an Email this morning off Bosch Worcester regarding this problem, They say it can be caused by expansion pressure pressure being low, or air trapped on the water side of the diaphram in the ev. As I have already checked the pressure in the ev and confirmed operation of the...

The flow switch raises, operates the microswitch, then remains constant i.e it is not drifting up and down. also the temp of the water is constant. I will ring Bosch Worcestor in the morning. Thanks for all your help it is very much apreciated. I will post the solution when I find out...

I have just checked the pump and it is not shunting on and off, I have checked for voltage at the pump when the surgeing occurs and have also inspected the shaft of the pump and there is no movement. I can hear a slight surging noise from inside the boiler which ties up with the gauge. Is this...

The mains filter has been checked recently during the service. Also I dont understand how the mains filter would affect the pressure gauge as this is detecting the pressure of the sealed side of the system. It only happens when the hot water is running, its as if the burner that is heating the...

Yes

Yes I have replaced all the sensors, I also removed the cover off the combustion chamber to gain access to the heat exchanger, replaced heat exchanger then re-fitted combustion chamber cover. the boiler is operating correctly i.e hot water ok, central heating fine, no noises etc it is just that...

I have a Bosch Worcestor 28si Combi. I have recently replaced the heat exchanger and everything works fine except when I run the hot tap, after a minute or so the pressure gauge on the boiler starts jumping up and down approx .1 bar and the is a slight surging sound from the boiler, Is this...