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Hello all thanks very much for help specially Mogget. I managed to source out the root cause....it turned out that ABV is faulty. I.e. it was not closed properly and water was pumped back to boiler before it reach to radiators!! I have ordered Mayson this time Honeywell has been returned. I have...

for unkown reason problem has re-occurred for all the zone again.. boiler again switching on and off every 2-3 mins!! Help please!!!!

Guys we update!! after Air bleeding the pump, zone 2 with 28mm 2 port valve zone started working with no issues boiler was on for 1hr.30mins without switching off.....however boiler is still switching off for zone 1 and 2 which runs off 22mm port valve any advice please

I thought it might be faulty programmer and this programmer is cheap and I had this as spare and thought will give it a go!! it does the same work as T740m any way...

Still in Limbo!! I replaced the programmer today from Drayton 740m to Heatmiser tm4-ts....still no luck...boiler shuts off every 1 or 2 mins....Can I replace the pump? or 2 port valves? Any advise will be appreciated

2 port valve is switching on the boiler and pump. how can they shut off? I checked the valve lever it was easily moving(open) when boiler was on and aswell as boiler was off....it may be something else?

its vented system...pump is set to maximum speed and I can see pump is running and piping hot!!

Mogget ..Yes return pipe is hot... Yes there is Auto-bypass valve .I think 0.2 bar as default. Rads are slightly hot...

Pump is running I can see the noise of water circulation. But boiler switch off every 2-3 minutes and fire back after 5-6 mins. Rads are cold aswell.

Boiler switch off every 2-3 minutes. Advise needed please, below is system speciffication System is fully pumped S plan 3 zone with Honeywell Auto-bypass valve following are the specification. Boiler: British Gas 330 Pump: Grundfos Pump Valve: 2 into Honeywell 22mm 2Port valve &1...

Just to confirm that I have made wiring as per Hailsham instruction and everything working treat!!! So far no sound from boile I see pump is running after boiler stop supplying heat! Thank very much for your help guys!!!

will try this over the weekend.....Any more advise guys?

Still in limbo help please!!!

Thanks D_Hailsham: Do you mean Boiler switch Live to 13? Please advise.

Advise needed on Pump overrun wiring please! System is fully pumped S plan 3 zone with Honeywell Auto-bypass valve following are the specification. Boiler: British Gas 330 Pump: Grundfos Pump Valve: 3 into Honeywell 22mm 2Port valve: 1>Heating Downstairs. 2>Heating Upstairs. 3>Heating...

Blagard: There is pipe from the boiler which runs to expansion tank believe it is vent and 22 mm back to boiler I assume it is cold feed. From cylinder 1 pipe goes up to the header tank and another one come back to cylinder. I will try to put some photos tomorrow. with respect to upstairs...

Mogget: Thanks very much detailed explanation looks like Mitime 5 pack is the way forward. Only draw back from the pack is does not allow to control through internet or phone...(May be I am being crazy) I know you always mentioned about auto bypass and also upgraded diagram. I went had...

Thanks I am thinking of creating 3 zones. so I need 3/4 channel programmer. How difficult is this for novice to take on? Considering wireless thermostat and cylinder stat installation?

Guys I have updated the image and drawn diagram. Please help

Hello all I still did not find decent engineer in Aberdeen. However did manage to trace the pipes with the help of Friend. Could you please see the attached diagram and advice what type system I have my friend reckon that its fully pumped system and easy to convert to S plan. Please note...