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Don't change the flow and return thermistors! The fact it is showing this fault almost proves they are reading correctly. They are there to sense temperature based on an NTC thermistor reading. They must be reading something to see a high difference and show this fault therefor they will be...

That's understandable Most boilers work in a similar way... Like a car for example. The principle is the same. They just have their own unique touches. A boilers objective is to supply heat. Once he understands the basics with sequences and how they operate he should be able to negotiate...

It's probably best to download a copy of the manual for him if you don't have one already. This should cover most of what he needs, then he needs to rely on his ability as an engineer

Unfortunately I'm no expert on these boilers but the APS and fan should be relatively straight forward to test. The APS will just look to have a circuit through it when the fan runs. You could test its operation by blowing/sucking down the tubes to it. Not sure on voltages to the fan on those...

Knowing which boiler and control is quite important. As a general rule of thumb it will either work on a mains voltage switched live, or a low voltage switching circuit. As long as the type of communication from the control can work with the boiler it shouldn't be a problem. The boiler will...

Haha you had me worried then Paul! At least now you have an argument to back your point about the yearly statement from the engineer. Oxygen in heating systems is what causes the corrosion in the first place so introducing more is only encouraging the issue. I hope this helps, NB

F25 is a temperature differential fault. It's telling you that the flow and return difference is excessive. If you gain access into the diagnostic menu (instructions tell you how) and look at D40 and D41. You will see that the difference between the two is 30 degrees or more. Lack of circulation...

Would a heat loss calculation not be more suitable to find out their requirement rather than opinions? its not criticism, just an observation.

It sounds to me like you may have a slight restriction within the system itself. It wont be the boiler thats the issue on the basis that some of the rads work, it could possibly be the pump on its way out but its less likely if there is some warmth in the rads. Whats the quality of water like...

Very interesting to see that you have to drain and refill yearly... doing so will introduce more oxygen to the system which will react overtime and cause corrosion to the metals (rads) which is probably where this metal is coming from. Water is natually oxygenated and overtime it will release...

sent you an email Tony Thanks

If you add me as a friend it should allow a Private Message function to appear... unfortunately cant get to my email at the moment Thanks

I will look into that :) If i can send you a private message i will enlighten you a bit more about me (looks worse than it is! :lol: ) On certain appliances i can provide a very large amount of electrical information in terms of operation and software. Thanks NB

Hi Tony, Thanks for your compliments. I like to try and pass on what little knowledge i have to help others. I have noticed many of your posts and you also have a good way of going about advice giving :) Where is this CC section of the forum and how do i join it? Thanks NB...

You're more than welcome, i can understand your frustration. :) It could be something very simple, its just getting someone thats capable of fixing the problem. Good Luck in getting it sorted! NB

as correctly stated above, you need the reset button to be working correctly before testing can accurately tell you the fault. Going back to your previous issues of F22 and F25, these arent down to a fault with the boiler but an issue with lack of circulation through the system. F25 is...

Dan could be a plumber, you failed to provide any details in the previous thread other than the fault, which would usually point towards the diverter valve. Therefor i would agree with the reply you were given. I am personally unfamiliar with the Firebird boiler so cannot be certain... The...

This made me smile :D if there is no diverter then it most likely has a bithermal heatexchanger (forgive me if im wrong, not familiar with the appliance). These work with a coil inside the primary circuit and reverse the circulation back through the boiler. It will most likely have a valve...

its very unlikely to be the HW sensor as previously stated, this is just an NTC thermistor on these if i remember correctly and its measuring the outlet temperature from the P2P h/ex. The Overheat stat is on the primary circuit so they arent linked as such. another point raised is checking...

what testing told you it was all 3 boards? dont see how thats anyone elses fault that you got it wrong. sounds like the only thing the technical team did was help you get it right, which i suppose they do on purpose.