Like the above said check EV should have 0.7bar(10psi) and after that the most common one is the hose from the top of the pump block to the EV will be choked up completely.
F12 "initially" means a fault between the main PCB and the user interface PCB (display board) loose connection or damaged harness. It can on glow worm's be linked into a few other things such as thermistors damp, loose or out of range, if it is the old IRIS style PCB check the fuse on the DC fan...
Is it the original Bcom24 with 3 neon lights or the Bcom24c with 7 neon lights? Any lights flashing or on static?
As 45yearsagasman rightly said you initially looking at the flow switch (original) or the flow sensor (the BcomC). Also worth checking is the hot water thermistors on both...
Agreed!
I was shocked to find out that tech advisors don't need no formal qualification?! There surely should be somthing other than competence???
I agree also with being led by the nose, but unfortunately there are many many "engineers" out there that 100% rely on tech help before they...
You are missing a major point here though.... Putting voltages, resistances etc in a MI, what then stops the home owner (who most people will have or be capable of getting hold of a multimeter) trying to fix/diagnose their own boilers... Or after yourselves have diagnosed a PCB them checking to...
I would tend to disagree with the 2nd part mylocalgasman, MI's can't possible list all info with regarding fault finding. Most manufacturer's new range of boilers have extremely good fault diagnosis built into the user interface's listing various fault codes indicating what is going off and also...
I generally go with the what ever the other person is addressing me as is acceptable to re address them with them same title.
As i am fully appreciative of "professional" service from these companies, Could i be right in assuming that mate would be classed in your eyes as unprofessional...
Haha nicko my thoughts exactly! :o
Agile, politeness and experience aside, would you take offence is a tech operator were to refer to you as "mate or pal" ??
Yes i am aware of that post but my question is more of how you prefer to be spoken to...
That thread was which company or tech lines do you rate or prefer :D
So what says you?
I was after your thoughts on how you have been spoken to when phoning various tech help lines...
More to the point. Do you prefer when the guy (or gal) on the end of the tech lines are down to earth, speak like we do and can communicate on your level, occasionally using mate or pal.
OR...
Vaillants prices are so because they are built with best materials available. Can't comment too much on the other two as only dealt with the vaillant brand(maybe bias slightly) but never had any major problems what so ever with them. Might seem slightly expensive but they are an amazing boiler...
Just clear something up for me please mate, from your question it sounds like you are having 2 problems?
1. boiler firing intermittenly with no demand on CH
and
2. radiators heating up when the DHW is running
If you are getting both of these then as Jordan says for the radiators...