Hot water stuck ON

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19 Mar 2009
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My hot water appears to be permanently stuck on. I've read through some posts on here and have an idea what the fault may be. I'm no expert but below is the info I have gathered:-

- Gas fired boiler Glowworm Ultimate 60FF
- Two 2 port Drayton ZA5 actuators, one downstairs, one in the loft by the cylinder
- Heating works fine
- Hot water stays on, pump is continuously pumping water around the system (and it doesn't normally), and the bathroom radiator is permanently hot as it normally is when the DHW is on (why IS this by the way!?).
- Hot water does not respond to the programmer switch
- Both actuators appear to switch across from A to B (and vice versa) sucessfully, the one on the cylinder switches over when I change the thermostat on the cylinder, the downstairs one responds when I switch on the heating. I even took the lid of the one by the cylinder and the valve could easily be turned by fingers
- Nothing has been changed recently, problem has ocurred on it's own

Is this to do with the hot water flow switch being stuck? I read it could be cleaned, if so how do I access (eg where is it!) it and confirm faulty and clean if it's a DIY job.

Thanks in anticipation.
 
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micro switch stuck inside the valve.
if you remove the grey wire from it's terminal it will stop.

free the the micro switch or fit new actuator.
 
Is this on the actuator on the cylinder? I did get it to open and close by changing the thermostat temp on the tank...
 
yes it will still open and close but the micro switch is getting stuck in
so when the valve closes the m/switch is still stuck on sending power down the orange to boiler/pump.
the switch gets its power from the grey wire.
the motor operates on the brown wire.
 
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Typical - it's not misbehaving right now! The orange wire is not live and the pump is not running. It's been on solid for about 3 days. Must have been me messing with it has loosened it a bit. I'll give it overnight and see if it reoccurs. Is it something that can be lubricated or just a gentle wack!
 
useally a poke with a screwdriver does it unless its knackered.
but yours has probably freed itself. :rolleyes:
 
Yes, it's fine now! Thanks for the super quick response, I know what to check if it plays up again.
 
Well it soon stopped working again - hot water (and bathroom rad still stuck on, boiler on continuously), the rest of the central heating working fine.

So I've replaced the motorised valve head and it's till doing exactly the same! Orange wire live when hot water should not be on.

Any ideas anyone please?
 
whats it doing on the A,B marker on the side is it returning back to A when hw off or satisfied ?
you say the orange is live when the hw's off whats the brown wire live or dead ?
 
I couldn't leave it! When the hw is off the switch is on A, orange live, brown dead. (I'm referring to the colour of the wires going TO the actuator, they are connected to wires of another colour).

When the hw is switched to on the brown is live, and the switch moves across to B.
 
that tells me the motor is opening and shutting when on/off etc at programmer or cyl stat.

the orange is live from the grey cause the m/switch is still on.
strange as it's a new actuator you said.

if working properly the only wire live when no hw called for should be grey.
 
Well if necessary I can swap it for my other actuator off the CH as that is a known working unit. I'll have to do that tomorrow because the previous house owner has platerboarded over the wiring and I'll have to cut it out!
 

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