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Zordiac
 
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Default Buzzing Central Heating = no heating

Can someone confirm my suspicions.....

New house, well 5 years old, and CH has stopped working though hot
water is ok.

When turn CH on I get a buzzing from the airing cupboard. Noise is
coming from a white box ie :

myson power extra mpe322
ipx2
6w 36mA motor load
max ambient 52 'c
water temp 5' to 95'
2 ports ie
ch dhw
porta portb

This has a manual override lever which is a bit stiff but can be moved
up and then to one side to sit in a slot. If I do this the radiators
then get hot.

I now understand that this box is an actuator and sits on a valve. So
I figure this actuator is the problem unless it is the valve that is
sticky. So removed actuator from valve turned CH and it starts its
repeated buzzing again. Also the valve does not appear sticky. So I
think it is the actuator except I am confused in that when I move the
manual override lever - remember actuator is not connected - then the
heating appears to start ie I hear the pump start up. The lever did
not appear to turn the whole in the centre of the acutator. I thought
this should happen ie that the valve would need to be turned. The
valve appears to stay in an 11'0'clock position which I think means
supply both HW and CH.


I have had a look for the actuator and seen the myson mpe322 at :

http://www.discountedheating.co.uk/c...ue_Th ermosta
s_306%2ehtml%257C%257C%257Chttp%253A%252F%252Fwww% 2ediscountedheating%2eco%2euk%252Fcgi%2dbin%252Fss 000001%2epl%253FSS%253Dmyson%252Bactuator%2526ACTI ON%253DGo%252521%2526PR%253D%2d1%2526TB%253DA%2526 SHOP%253D%257C%257C%257C%26PREVQUERY%3dREFPAGE%253 Dhttp%25253A%25252F%25252Fwww%2ediscountedheating% 2eco%2euk%25252Fshop%25252Facatalog%25252FOnline_C atalogue_Thermostats_306%2ehtml%25257C%25257C%2525
C%2526PREVQUERY%253DSS%25253Dmyson%25252Bactuator% 252526ACTION%25253DGo%25252521%252526PR%25253D%2d1 %252526TB%25253DA%252526SHOP%25253D%252B%2526RANDO M%253DNETQUOTEVAR%25253ARANDOM%2526PAGE%253DSEARCH %2526SS%253Dmyson%2526TB%253DA%2526GB%253DA%2526AC TION%253DSearch%26RANDOM%3dNETQUOTEVAR%253ARANDOM% 26PAGE%3dSEARCH%26SS%3d322%26TB%3dA%26GB%3dA%26ACT ION%3dSearch&PN=Online_Catalogue_Myson_277%2ehtml%
3am#am

but this just seems to refer to valves and not acutators.

Am I right in thinking its the actuator thats at fault and can anyone
recommend where to obtain a replacement? Thanks.
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The Natural Philosopher
 
Posts: n/a
Default Buzzing Central Heating = no heating

Zordiac wrote:

Can someone confirm my suspicions.....snip



Yup. Its a 'motorised valve'

Current drives the motor, the motor opens the water flow AND swiches on
the pump.

The override lever also does the same.

You can get spare motors at nearly all plumbing supply places - take the
old one in.


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Colin M
 
Posts: n/a
Default Buzzing Central Heating = no heating

I have had a look for the actuator and seen the myson mpe322 at :

http://www.discountedheating.co.uk/c..._277 %2ehtml%

Try http://tinyurl.com if you want to post long addresses, most peoples
newsreaders will split the lines making it impossible to refer to the link.

Colin


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Zordiac
 
Posts: n/a
Default Buzzing Central Heating = no heating

Thanks chaps for the advice. I went into the local Plumb Center and
picked up an acutator for only £35 inc vat. Fitted it and now the CH
is working fine.

Only concern is that this is the 3rd actuator in 4 years. First one in
was duff and now I've replaced the second. Also when I contacted
another local plumbing merchant the person I spoke to said that their
relative was on their 4th actuator in 6 years! So are Myson products
duff? I noticed with the one I bought that there was no mention of any
guarantee.
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