Central Heating problem

[Vass]

I have an old Wickes 40 balanced flu boiler in a 60's semi rads are connected via microbore New Pump, Cylinder, valve and C27 controller

The problem is (CH on only not HW) the boiler can be heard boiling then cuts, and within a minute starts boiling (kettling?) again and this just goes on and on. The know on the boiler is turned to MAX The house sits around 18 degrees not getting anywhere close to the stat on the wall, and the cupboard where the boiler and cylinder sit is roasting hot

Any ideas? could the pump/valvue be wired incorrectly or something? Fingers crossed its not new boiler time?

Thanks in advance

[Dave Plowman (News)]

You need to start by measuring the flow and return temperatures of the pipes at the boiler.

[joe public]

Hi All

Thank you for your replys.

I have not moved the unit and I have changed the batteries. On the receiver box there is one constant green light and one flashin red light.

I have been to honeywells website but it will not allow me to downloa the instructions. What is this "special way" to get them talking again.

Thank you for your ongoing hel

-- joe public

[Roger Mills]

The Honeywell site seems to be back on-line again. Is this the installation manual you need - if not, there are lots more to choose from?