Help diagnosing a short cycling Ideal Icos HE24 boiler

[ShaunCorbs]

http://www.ukplumbersforums.co.uk/c...help-diagnosing-short-cycling-ideal-icos.html

Just a little update for you guys, went out today, nice little drive

You were right aw and riley

D2 all the way in 15mm until under the floor i hope, and no way im going to mess with that unless he really wants a bill, as it runs behind cylinder straight down, so cylinder needs to come out and dont know whats in the floor :dizzy2:

Short cycling only happens when just one or two zones on the under floor are on, doesnt short when any of the single heating zones are on eg 1st floor, 2nd floor/ hot water etc so put it down to boiler not modulating enough

Anyone know if the icos he modulates? as i dont think it does well not much if it does

Found another problem while i was there got 4 under floor zones (7 circuits 2 singles loops and 1 dual and 1 tripple) the tripple loop doesnt turn the pump on / zone valve so faulty controller, fine if you have another loop on but doesnt work on its own :rolleyes2:

any questions / thoughts please add

 

[Chalked]

Could the thermostatic blending valve on the ufh be sticking? If there's no bypass this will cause the prob.

 

[ShaunCorbs]

Could the thermostatic blending valve on the ufh be sticking? If there's no bypass this will cause the prob.

nope all good and no bypass on uf but theres one on the main f and r

 

[Billy Bob Bob]

bypass req maybe?

 

[ShaunCorbs]

bypass req maybe?

dont think it will require on on the uf ? but opened the main one an extra 1/4 of a turn just incase

 

[Leo21]

Hang on, an I so that's an Icos working. Am I reading this right?

 

[ShaunCorbs]

Hang on, an I so that's working. Am I reading this right?

? explain as dont get what you mean

 

[Leo21]

? explain as dont get what you mean

I've re done my post. Ideal icos boilers rarely work!

 

[ShaunCorbs]

I've re done my post. Ideal icos boilers rarely work!

for now and good readings tbh

ratio of .0002 and 37 ppm

but tbh it was rebuilt with new parts from ideal about 4-5 years ago