y plan not working properly

[martinmich]

hi my yplan will not let the heating work unless the cylinder stat is calling for heat

 

[dcawkwell]

Perhaps a faulty wall thermostat that isn't turning on
and the valve has been faulty for a while letting heat
pass into the central heating.

 

[45yearsagasman]

The valve is either seized or the synchron motor in the powerhead has failed, or it's wired up incorrectly. Or as suggested above.

 

[matt1e]

From your symptoms the heating is only working when the valve is in mid position so either
1)The cylinder stat is faulty,check for this by selecting central heating only on the programmer If the heating now works ok then the cyl stat is faulty or the wiring is
if the heating still doesn't work (which is the most likely scenario) then

2) the microswitch in the valve actuator is failing to make when in the heating position either due to the switch itself failing or the valve is starting to seize up and not traveling enough to make said switch

Matt

 

[Johnny B]

Hope this helps

 

[Deleted member 221031]

Should have put that up while Lemon 1 was on the forum. Might have helped his limited knowledge

 

[dilalio]

Promoting that YouTube video by ressurecting several old threads.

 

[Hot&Cold]

Hope this helps

Not really,there are variants on 3 port systems.

But i had a look through your other ytube offerings looking for more heating information but there is no more

One of your ytube offerings has the cat,is the cat Ok