I am having trouble with my boiler. The plumber has just says that it is the diverter valve and is taking forever to get a price on one. I have checked the manual and also this website but still need some help. This is what happens. Turn on hot tap and after a couple of seconds the bolier fires up. The water becomes luke warm and then after about 30 seconds the pilot light goes out and then comes back on a few seconds later, hense no hot water. I have read the different posts saying that it might be the diaphragm but the small piston is coming out as it should. Please can someone help. Cheers
Biasi riva compact 24s NO HOT WATER !!
- Thread starter coombs
- Start date
Sponsored Links
From your symptom the problem is most likely to be the domestic plate heat exchanger which has become blocked on the primary side (not scaled on mains side). Boiler then thinks HW is satisfied (though proper heat transfer not taking place) and keeps prematurely shutting down.
Cheers. Another solution to confuse me.What about the DHW flow switch? :{)>
Also,if it was the problem you are saying how do I fix it? The reason I asked about the flow switch is on another post someone is saying they replaced a temp sensor as it thought the water was getting to 60 degrees and then shutting the boiler. I am assuming that the temp sensor is the flow switch !?!
Sponsored Links
If it was flow switch it wouldn't fire, if it was temp sensor water would overheat then go to high limit. Don't always assume boiler parts have failed. It sounds like yours works and the only fault is caused by a dirty system which the boiler can't help. Feel primary flow to DHW exchanger whilst running HW pipe should get red hot.
To fix problem you will need to be competent with parts replacement.
To fix problem you will need to be competent with parts replacement.
Forget the flow switch and diverter, you plate hex is full of carp.
No point cleaning or replacing it as the whole system will be soiled.
Powerflush will cure the problem and stop it from coming back. If done properly that is.
No point cleaning or replacing it as the whole system will be soiled.
Powerflush will cure the problem and stop it from coming back. If done properly that is.
Thank you so far. I am not sure which pipe you mean. If I describe it as the pipe that comes out of the diverter valve,runs across the back and disappears up into the boiler - then yes, this one is cold but when you turn on the hot tap it gets red hot. Do I assume that you are right and everything else in the boiler is working correctly and as it should? Also you say it should be replaced but can it be cleaned out? P.S if it does need replaceing can you recomend a good stockist that won't rip me off. P.P.S I don't mind replacing the part as long as it will solve the problem as general trial and error could prove very costly !! Cheers :{)>
you plate hex is full of carp?? Can you explain please.This sounds like something my Russian girlfriend would say :{)>
No she sometimes doesn't put the right words together especially when pi**ed. Any way,do you agree with what the other guy is saying? I think he does know his onions. P.S The DHW heat exchangers are looking at about 80 quid - does this seem right to you? P.S what is RGi ?
Also what do you think of the powerflush idea? If I just replace the heat exchanger it may only fix it short term. The heating system in general is quite noisy(knocks and bangs),so could benifit from a good flushing.
Please hear what you are being told! I know that all plumbers are thick but the people giving you advice here are likely to know more that you do about boilers!
Your plate HE is blocked but as far as we can tell the rest of the appliance is functioning correctly.
You need to clean or replace the plate HE.
As the boiler should be about 3-4 years old then its taken this long to get to this state so should be at least that long before it blocks again.
A power flush or a £100 Magnaclean or a £6 line strainer will remove or trap the debris in your system.
Tony
Your plate HE is blocked but as far as we can tell the rest of the appliance is functioning correctly.
You need to clean or replace the plate HE.
As the boiler should be about 3-4 years old then its taken this long to get to this state so should be at least that long before it blocks again.
A power flush or a £100 Magnaclean or a £6 line strainer will remove or trap the debris in your system.
Tony
Thank you Tony but I am listening to what I am being told but so far you are the only person who has replied since I edited my last post. I'm not saying anybody is thick but all this is giving me a bloody headache (even more so now that a powerflush has been mentioned,together with diaphragms,heating sensors and microswitches). If you read my main question it is can the heat exchanger usually be cleaned or does it have to be replaced. If it is replaced,will this be the end of my problems? Cheers :{)>
The diaphragm was mentioned by someone who does not know that your boiler does not use one!
The sensor was a fair but misguided suggestion.
A microswitch was probably mentioned by the same person why wrongly thought there was a diaphragm.
You can clean it if you know how or you can replace the plate HE.
You could clean or strain the system or just wait another 3+ years and do the same thing again.
Tony
The sensor was a fair but misguided suggestion.
A microswitch was probably mentioned by the same person why wrongly thought there was a diaphragm.
You can clean it if you know how or you can replace the plate HE.
You could clean or strain the system or just wait another 3+ years and do the same thing again.
Tony
Thank you.
The plumber just said it was the diverter valve.
The other suggestions I found were from people on this website who were having the same symptoms as me and the problem parts were diaphragms and temp switches. Also regarding you saying the boiler doesn't use a diaphragm,even the manual and other websites are saying there is a diaphragm. Anyway,I'm not here to argue with you.Thank you for your help and once again am I better off cleaning the HE and if so how or just replacing it?
You could clean or strain the system or just wait another 3+ years and do the same thing again.
Please explain.
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
Sponsored Links
