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i had the same prob...but it was caused by the w.c cistern....fitting of a torvec valve which has a screw device which restricts the flow of water to the cistern,thus competely stopping water hammer :lol:

changed the gland nut :D :D all now spot on///hot water & heating cheers namsag :lol: 8)

i said the leak is from the dhw,sorry its from the heating valve on the 3 way manifold,pretty identical to the dhw valve,still i changed the diaphragm as stated earlier post,it seems that the heating comes on for 1 hour then goes off,the pin on the valve stays in? i assume that when the system...

cheers :lol: will try that today & let you know////i just assumed that no water should get past the diaphragm....

i have a baxi 105e instant,flue warning light on ,i noticed a leak from the dhw valve,leaking into the microswitch,i changed the diaphragm,it worked perfect for one hour then i noticed it is still leaking?? any help appreciated :(

namsag (genius) think i,ll just change it,,,seems like theres been a slight leak around the valve as well?

:D the boro postman pats better than the tin tin,,,they should do a boro heating engineer(you,d have definately got some good swear words out of my place? :lol:

cheers for your help seems like it was a microswitch. you,ve made me hungry now,i could defo do a parmo now. (parmo army) used to go to vicky rd school (r them were the days ey) :D :lol:

:D :) :lol: cheers namsag " your an absolute genius mate" i pulled off the top microswitch & the CH worked with it off,does that pin supposed to move in & out(the bottom one DHW does) anyway i put the microswitch back on and moved it about a bit & hey presto its still on" Do you reckon i...

:D cheers namsag...i,ll give it a try in the morning

i fitted part No 248731 as you all said,so if its not the pcb,,theres a spare one going cheap? scuse my ignorance but how do you check the pin on the divertor /microswitch? seems worth a try

baxi 105E fitted new PCB fitted new APS fitted new relay switch sensor hot water & preheat ok,sounds like the fan is on constantly/all lights on apart from the central heating light?

cheers for that....i,m a bit confused how your a smoggie though? just turned it on again today got a shower & the heating came on for an hour? do you think it is definately the pcb,,the fan still runs constantly i,ve changed the APS ,checked the flue.etc

oh s**t thanks lads ++++++++++++++++++++++++++++++++ its definately a 105E and it has 3 dials 1) ch 2) water only 3) water preheat? the rep reckons that the board 248731 has been upgraded to the 5112380? he must have got it wrong?

does any one have the fitting instructions for the upgraded PCB 5112380 i have been given the latest pcb, no instructions included ( the rep who gave me it stated that it was a straight swap of all the connectors "like for like"but there is no connector for the A8 block this block feeds the...

the fan/flue light as gone off since i fitted the air pressure switch,but the fan is still spinning continuously and no CH? There is definately no A8 connector on the pcb? do you think that i may have the wrong pcb?it was sent to me by a Baxi rep? could the reset selector switch be...

:( any help appreciated(1st timer) i have a baxi 105e,the fan is constantly running? the fan/flue warning light comes on- i have changed the air pressure switch-still the same? i have tried fitting the new pcb 5112380,but excuse my ignorance,but there is no connector block for the A8...