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Hi All, A simple question (I hope). I have a Drayton Tempus 7 programmer/timer. This has a switch on the back labelled 'Pumped --- Gravity'. Idea is with a Gravity fed DHW the HW circuit is supplied if the CH is on. However I have a C-plan control system set up with a 2-port MV in the...

Thanks Baxpoti, I'm suspecting the PCB but will probably replace the Control Pot as well. The Pot does seem to measure okay on both sides of the wiper. As this is a Back boiler the FireFront has to be removed and as this involes a spanner and gas connection as I'm not allowed to do this...

Thanks for that, It is definitely an Inset 2, it says so on the boiler and the manual. To give it the full title from the manual 'Baxi Bermuda Inset 2 Boiler 50/4E'. (The 'E' meaning it has an electronic spark igniter.) It does have a PCB with a PCB GC no. E00-118 and a Manufacturers...

Hi All, I have a Baxi Bermuda Inset 2 (Back boiler). I have just had the the Tempreature Sensor replaced and this has cured the problem I had with the boiler trying to start up but not lighting, going out quickly and trying to start up etc. (Its a Gravity fed DHW/Pumped CH in 'C' plan...

I have a Corgi registered plumber coming round this afternoon. Two updates on this. 1) The pump is working I can hear it going round and water is being distributed. But I drew off some hot water from the tank and now the system 'seems' to be working better? I can't verify yet if these two...

Hi All, Baxi Bermuda Inset 2 Back boiler. No air in system, checked. Room stat properly calling for heat. Pump running okay. Boiler fires up and goes out almost immediately. This repeats several times before it stops for a long while. Pilot does come on and one in several times...

If you call in an expert you will not get shafted. The problem is in all those glossy adverts how do you spot an expert!

Okay, So I tried the boiler stat Potentiometer. Didn't seem to change anything. If I set it to max and wait till boiler fires and then turn it to min. Nothing happens. So I set it to middle and put pump on 2 and turned up RoomStat to 25C. Two hours in the flow pipe reads 95C (I'm using an...

Fair comment! If I undo the bleed screw I get water. So I don't believe the pump is spinning in air but that's definitely worth checking further. Any other checks you can suggest to verify circulation other than checking the rads do actually heat up and that water escapes from the bleed screw.

Hi Dave, A good thought! But I use the old screw driver to ear trick and I can definitely hear the pump turn. (I also switch the pump speed during this check to ensure the pump speed changes.) So yes I am confident the pump is spinning when the system tells it too.

Hi Dave and Seco, Thanks for your replies very helpful. Yes the boiler is due a service and of course I will use a RGI. I'm happy and confident doing both plumbing and electrics but the rules are use and RGI if gas is involved. So that's fine. I'm really in 'trying to understand' mode...

Thanks Seco I missed your post so a quick follow up. Boilerstat is set to minimum, at present. I will do some more 'scientific' twiddling with it shortly. Pump Setting; I have found following when system is at operating temp and well before the 'overheating' occurs. Speed 1: Delta T...

Thanks, Dave, I just wanted to specify the wiring because the original wiring was awful and did not work as an interlock. (Boiler would appear to stay on even when Room and Cylinder were okay.) I doubt it's sludge because the inhibitor is religiously updated every two years and I do a...

Hi All, I have Baxi Bermuda Inset 2 Boiler 50/4E and Graivty fed HW/Pumped CH system. I have roomstat, BoilerStat and 2port Honeywell valve. System has been wired using Honeywell C-plan schematic. (Note the red spots indicate which positions are live under various conditions, above shows...

Thanks twgas, That's my next step. The MV is being operated from the CylStat but I am now convinced that the auxilary switch isn't connected correctly (i.e. I think it's bypassed by the wiring) an so although the valve closes when the tank reaches 60C the live feed to the boiler is not...

LUNAT's right there are several possible reasons for 'pump over'. You don't say if it's gravity fed or fully pumped. Nor if there is a Motorised Valve on the hot water return. I have had a very similar problem to this and I have traced it to faulty wiring. (Basically the boiler should not...

Okay final test tonight. Got the water up to temeprature and the heating. Then set the Roomstat to minimum and likewise the Cylstat. So technicallythere should be no call for heat. The MV was closed and the pump was off as expected. I set the controller for hot water only. Within...

Thanks for that, I did have that thought at one stage. However it is my understanding that the boiler should be controlled in such a way as to only fire up on demand. The 'on demand' signal comes from either the Cylstat, roomstat or both. The purpose of the boilerstat isn't so much to add...