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the Icos has a drain off underneath it nr the isolation valve, isolate the the flow & return and place a bucket or something similar underneath and undo the drain cock, the pressure should drop to zero. When undoing the the 4 allen keys for the pump, undo the bottom 2 first and slowly undo the...

you seem like a decent yank merry xmas china and wind ya neck in :?

Don' t think Potterton make new fires esp for the old Fireside 51's n 52's.

what gassafeman said, get rid of the that pile of .... and get a decent combi put in.

your external condensate pipe had frozen/blocked

you won' t be fitting a back boiler in this day and age unless its the new Baxi condensing BBU that they' ve just invented allegedly.

He' s right, if you remove the Central Heating Honeywell cover (soundslike the faulty one) and see 4 screws that attach the head to the body you need a plumber (or some bungs), if it has 2 screws, 1 at the top the other at the bottom you can unscrew those and remove the head. Turn the the...

depends on who fitted the fan ?? it should still be under warranty (if its new) from Baxi.

set the cylinder stat to 50-60 Deg. Cent or 120 Farenheit which' ll give you close 50 Deg. , adjust accordingly to suit your dhw needs.

turn the landing the light on instead of waiting til tomorrow :wink:

does the cylinder have a thermostat attached to it, 2/3 of the way down ??

or your cold feeds blocked ??

pop your finger or thumb underneath the black arm and see if you can lift it out of the midpositon its stuck in or as stated above depress the black button on the side of the head and take the actuator off the valve body and check the body isn' t stuck.

The overheat stat doesn' t reset itself, you have to pop the switch back in yourself. The grey facia underneath the boiler has a hole in it, stick your finger in there and hey presto, there' s your OH stat. You sure its gravity when you have a 3port valve also ??

and the odd leak :lol:

You say the actuator for the motorised valve is new ?? Check that the black arm at the top of the valve is out and moves freely between heat & hot water modes.

If you had a problem with circulation the Profile has an overheat stat in-built which would trip the boiler making it inoperative. Try turning the rads that work off to get the CH circulating to the other rads and try adjusting the pump speed upto 3 if its a Grundfos. Dependant on your area...

sounds like a faulty air press switch