Discuss Eco Elite 30 short cycling on CH in the Central Heating Forum area at PlumbersForums.net

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Hi Folks,

I have a challenge with a Main Eco Elite 30 Combi which is short cycling on the CH. Water works fine. As soon as you have call for heat, the boiler fires up, modulates, but jumps very quickly (about 30 seconds or so from 40'ish all the way to 70, burner disengages putting it the boiler into its 3 min cycle for it only to repeat. Radiators upstairs heat up (moderately but not optimal) with downstairs stone cold. 9 radiators in total.

Was advised originally that a powerflush was required. 2 x full circuit powerflushes, plus a boiler flush on its own. The main heat exchanger was also removed by the engineer and manually flushed, followed by a powerflush directly (as thought it may be blocked)

CH Return flow pipe still does not get up to temp as the short cycling is probably not allowing heat to circulate all the way round the circuit as a result of the short cycling?

The following have already been changed

CH temp sensor
Diverter valve
Pump
DHW plate exchanger
DHW temp sensor

Pretty frustrating as the boiler still short cycles. The interesting thing was when the boiler inlet outlets were connected to the powerflush and boiler switched on, still seemed to short cycle, even with a decent powerflush flow.

The only thing which has not yet been changed is the inlet assembly, could there possibly be a block between that and the main heat exchanger?

Any thoughts please.

PS, yesterday when the DHW engaged, almost felt as hot water was being let off into heating flow pipe, Engineer swapped out replaced diverter for a new one this morning , but it has not resolved the situation.

As a next step, the Engineer is now wanting to do a second powerflush of the boiler alone with some chemicals (ferrnox f2 )and run that for an hour or 2 as he thinks the main exchanger may be scaled up?)

Any thoughts or ideas please....

Al
 
Return filter clean in the valve ?
 
I had a problem like this about 24 years ago on a heating system in a house in Keithley. The boiler was also short circuiting. Three other plumbers had been before and hadn't fixed the problem. I asked what the other guys did so as not to repeat their fault finding. So, what I did was to open all the rad valves to fully open (both sides) then run the boiler with the pump on full. There was an almighty gurgle and banging noise and everything started to work. It was an air (hydrogen) lock. I then rebalanced everything, bled the rads and that was that.

It might be worth a try on your system.
 
I had a problem like this about 24 years ago on a heating system in a house in Keithley. The boiler was also short circuiting. Three other plumbers had been before and hadn't fixed the problem. I asked what the other guys did so as not to repeat their fault finding. So, what I did was to open all the rad valves to fully open (both sides) then run the boiler with the pump on full. There was an almighty gurgle and banging noise and everything started to work. It was an air (hydrogen) lock. I then rebalanced everything, bled the rads and that was that.

It might be worth a try on your system.
Thanks Rplumb, it was the first thing we tried..... but to no avail
 
What kw of rads do you have and 10mm to them or 15mm ?
 

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