combi boiler probs


  #1  
Old 07-25-05, 01:26 PM
bron
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combi boiler probs

can only get hot water intermittently on my combi boiler at the moment. Works fine when heating is on. Could it be something to do with water pressure? I went away for a few days, then the probs started. The only other thing I can think of is that a friend messed around with the stopcock while fixing my toilet last week - to stop water dripping from the overflow. Any advice gratefully received as am about to move house and don't want to leave problems behind. Thanks
 
  #2  
Old 07-25-05, 04:31 PM
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combi boiler

What is a combi boiler? The only time in 20 years in the trade I've heard of a combi boiler is on this site.
 
  #3  
Old 07-26-05, 03:02 AM
bron
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sorry

combination boiler???? thought this was a site for getting help ....
 
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Old 07-26-05, 10:03 AM
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From the info you have given it is quite possible that the stop **** could not be turned on enough so the microswitch on the diverter valve is not making.The hydrolics inside the boiler could be moving thats why you get hot water when the c/h is on but the boiler will be thinking it is just giving you c/h. If it isnt low water pressure the diaphragm may be worn or split.If you tell me the make i may be able to give more info.
 
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Old 07-26-05, 10:06 AM
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Grady i believe you call then combo or wall hung hydronic boilers.
 
  #6  
Old 07-26-05, 06:17 PM
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Terminology unfamiliar

Bron,
Like I said I've been doing boilers professionally for 20 years & when I joined this site a few months ago was the first time I had ever heard of a combi(nation) boiler. Do you mean a boiler with a domestic coil, a boiler with an indirect water heater, or something else entirely? I'm sorry the terminology is completely unfamiliar to me. If someone will enlighten me as to exactly what we are talking about, I'll do my best to help.
 
  #7  
Old 07-27-05, 01:15 AM
bron
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thanks

for your replies, no worries Grady. Andy, it's a Biasi boiler, will have a look at the stop****. It works from ok from time to time, I can't figure out why. If it it a fault with the diaphragm is that likely to be costly?
 

Last edited by bron; 07-27-05 at 01:17 AM. Reason: add info
  #8  
Old 07-27-05, 02:45 AM
bron
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problem solved

at least I hope so. Increasing the water pressure seems to have done the trick. Simple when you know how. thanks guys
 
  #9  
Old 07-27-05, 11:13 AM
bron
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spoke too soon!!!!

back to square one after a false dawn, when all seemed fine, now having same problems again. Please help!!!
 
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Old 07-30-05, 10:30 AM
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Im quite sure the biazi combi has a diaphragm which moves when a tap is opened. If the diaphragm isnt split then there are usualy 2 impulse tubes that provide high and low pressure on each side of the diaphragm they are about 8 mm in diameter and sometimes these can become blocked with dirt and if so would require cleaning out. Diaphragms cost between 5 and 10.
 
  #11  
Old 07-31-05, 07:45 AM
bron
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thanks

will get it checked out
 
 

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