Paging the central heating-isti

Gas fired condensing boiler.

Thermostat on the boiler for water temperature.

Thermostat in hallway for central heating.

Switch off central heating, on control panel under stairs, leaving hot
water function running - and it doesn't get hot. Only gets hot if you go
back to CH and turn up the hallway thermostat.

Turning up thermostat on boiler makes no difference.

Turning up thermostat on hot water tank makes no difference.

Hot water tank now running on immersion heater as it's the only way we
can get hot water unless we want to live in a greenhouse.

Diagnosis? Solution?

 

The current tenant of the last house I rented would be interested to see
the answer to this. Shame he won't.



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Dnc

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MIB#26 two#54(soiled) UKRMMA#26 BOTAFOT#153 X-FOT#003

 

GAMI

 

This happens in my house as well. Timer clock thing has both HW and CH
switches on it. CH works independantly, but the HW requires the CH to be
on. I don't have a fancy condensing boiler though, I dont think I have
a 3-year old Baxi Back Boiler number. Don't know if it makes any difference
to the equation, but I also have an Immerser switch which works, but costs a
bomb to run, so I dont.

Andy

 

We had probs with our CH a couple of times last year, ended out
replacing the valve and the water pump within a short period of time of
each other.

This link might be useful to you, but to be honest I rely on a man who
can..

http://home.btconnect.com/centralheating/helpmate/Central_Heating/centra
l_heating_problems.htm


--
Lesley
CBR600FW
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BOTAFOT#101A UKRMHRC#12
BONY#54P BOB#18
Real burds don't take hormones, they rage naturally

 

message

Shut all the valves off on your radiators?

 

It sounds like a three-way electrically operated valve which is supposed
to divert hot water from the water system to the heating system is
stuck. It will depend on whether your system is Y-plan or S-plan or
"other" but should not be difficult for a competant person to fix and
shouldn't cost much either.

I'm a bit pissed so this advice may be bollocks so wibble. .. .

 

I get a similar problem with mine. It's the y valve on my older system.
But I have a shut off valve (tap) I can turn off to stop the hot water
going round the CH radiators. You might have one.

 

I knwo the thing your'e talking about there, had one in my old house, which
wasn;t a back-boiler. Wee square box in the middle of a pipe next to the
immerser boiler thingy. Had a 3-way switch with "Open" "Closed" or "Manual"
on it. have no idea where the immerser is in here never mind the switch. I
might phone the council to look at mines and let you know what my diagnosis
was. I had just decided it was supposed to do it...

Andy

 

It sounds like a diverter valve type of problem, but ...

If you went into a Bike shop and said you had a problem with a 750,
what's the first question they might ask ?

make and model maybe ?

 

I'd suspect a stuck 3 port valve, but I can't see how turning up the CH
hallway stat would right it. Unless it's stuck partially open, so the
majority of heated water is going to the rads and say a third is going
to the hot cylinder.
--
Dave
GS850x2 XS650 SE6a
Every post contains Nutri-Ceramide-R and Pre-Biotics
for your reading pleasure.
Folding@Home Team UKRM
http://vspx27.stanford.edu/cgi-bin/main.py?qtype=teampage&teamnum=47957

 

"A blue one"

 

I hadn't actually. We just switched on the immersion heater.

 

Whereas I wouldn't, necessarily. If the boiler isn't chugging into life when
you crank
up the water thermostat and water heating is switched on at the control
board,
then it is more likely going to be a thermostat/electrical/control box
problem.

The reason the water will be getting hot if you force the CH on and you
still
have the water control circuit switched on is that the tri-way valve will be
in it's mid-position, supplying water to both the CH and water circuits.
Try turning off the water heating on the control board and repeat. If the
water
still gets hot it'll either be a buggered valve or (more likely given the
lack of
boiler activity when the water thermostat is turned up) the control
circuitry.

If you can access the tri-way diverter valve and it has a manual override
(lots do). A simple way to verify that it isn't the diverter is to switch
it manually to CH only and crank up the boiler (using the CH thermostat),
only the radiators should get hot. Then (after the rads have cooled down)
manually switch the valve to 'water' and crank up the boiler again. Hot
water and cool rads should result. If that works, then your diverter valve
is OK. Look to the electrics particularly the water themostat control
circuits.

 

Cool, It's all explained here:

http://www.diyfaq.org.uk/plumbing/plumbingpage2.html

simonb

 

Bookmarked!

 

Which is why making known the make and model would be a very good next
step