Central heating always on

[yunus7]

The central heating is always on even when it is turned off at the timer control. Also the pipes make a constant humming noise. Bleeding the radiators hasn't helped.

The system includes a 2-point motorised valve, a valve actuator, a flexcon expansion vessel, a combi boiler, a water tank and lots of pipes and wires.

Any ideas?

 

[kevplumb]

read this and please edit your post with the info

 

[ChrisR]

lots of pipes and wires.

Ah, there's your trouble

 

[gazthepottertonengineer]

id be a bit worried if it didnt have them

 

[yunus7]

1) Boiler make / model (gas or oil)
GAS, HONEYWELL
2) What is / is not happening
HUMMING IN PIPES WHEN SYSTEM IS ON. THE RADIATORS ARE WARM WHENEVER THE SYSTEM IS HEATING WATER.
3) Has ANYTHING else been done / changed recently
NO. MOVED IN ABOUT 9 MONTHS AGO AND NOTHING'S BEEN DONE SINCE.
4) When did it (problem) start
THE HUMMING STARTED A FEW WEEKS AGO. THE CENTRAL HEATING PROBLEM ABOUT A WEEK.
5) When does it happen? eg, heating coming on or going off
AS ABOVE.
6) Anything else you feel may be of relevance
FIRST FLOOR FLAT.
SYSTEM INCLUDES A TWO POINT MOTORISED VALVE, A VALVE ACTUATOR, EXPANSION VESSEL, A MYSON COMPACT CP53 PUMP.


Thanks for your help. All replies appreciated. I'm definitely sure about the pipes and wires.

 

[kevplumb]

1) Boiler make / model (gas or oil)
GAS, HONEYWELL

thats the gas valve
the boiler make / model might help

two port valve or a three if two there should be another i would think