Ideal Icos HE12 keeps firing

[isus24]

Hi,

My HE12 boiler keeps firing even when the timer is off. The only way to stop it is to turn it off by the switch. I think the heating motorised valve is sticking, would this cause the boiler to keep running? Also, if I don't switch the the power off to the thermostat, pump etc, the pump keeps running (or at least it feels hot, I have just replaced it and it is very quite!). So at the moment I turn off everything until I want heat and then turn it on and manually open the valve.

My questions are:
is it likely the it is the faulty motorised valve causing the problem? (The hot water one also sticks and has for ages with no noticeable problems)
Am I doing any damage by turning the boiler on and off at the switch and effectively creating a manual heating system?
If it is the motorised valves, could these be replaced by s diy-er - I did the pump, but not done much plumbing...

Many thanks in advance for any suggestions help etc

 

[townfanjon]

Yes is sounds like the valves they have an auxiliary switch in them what is wired back to the boiler, depending on who's they are you maybe able to change the actuator ( the bit on the top )

 

[kay-jay]

simple check
turn off the switched fused spur beside the boiler, then go to your wiring centre and check that nothing is live. then remove the orange wire which comes from each of the motorised valves. turn the switched fused spur back on and check if either of the orange wires are live then this is your faulty valve!

 

[isus24]

Thank you townfanjon and kay-jay, I will check it out.