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Why the 'mid position'? Mid position is when there is a call for heating AND h/water.
Dunno why, but I smell a rat here. Its a wiring issue is this is a genuine topic.
Im out.
Potterton Profile, hot water no heating
- Thread starter Nessie91
- Start date
Why the 'mid position'? Mid position is when there is a call for heating AND h/water.
Dunno why, but I smell a rat here. Its a wiring issue is this is a genuine topic.
Im out.
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As others have said,it's a wiring issue, and I don't believe the fan is running either ( are you sure you don't mean the pump)
The reason the boiler isn't firing is that the valve needs to open fully to the heating position and not the mid position as you describe above
You have a problem with the HW off side of things, check the valves grey wire connection it should have 230 on it when HW is off and work back from there to the programmer
Matt
Sorry, yes valve moves to mid position, and pump does activate.
You said the fan works! Thats different from the pump and is in the boiler!
Is the boiler knob turned on and the lights correct? do they change when you provide the call for heat? What happens if you press the reset button?
You may need a boiler engineer!
Tony
Is the boiler knob turned on and the lights correct? do they change when you provide the call for heat? What happens if you press the reset button?
You may need a boiler engineer!
Tony
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The boiler is on the ground floor, and the pump and valve are in the loft so I cannot physically check both at the same time.
Part of the start up routine for the boiler is that the fan runs, which was not happening before, the pump and the valve also appear to operate when calling for heat on the CH side.
The boiler thermostat is fully on at maximum, however there are no lights on the boiler so they cannot indicate anything, the overheat stat has not tripped, so has not had to be reset.
Part of the start up routine for the boiler is that the fan runs, which was not happening before, the pump and the valve also appear to operate when calling for heat on the CH side.
The boiler thermostat is fully on at maximum, however there are no lights on the boiler so they cannot indicate anything, the overheat stat has not tripped, so has not had to be reset.
So boiler fires when hot water only is called for? Yes?
Boiler fires when both hot water and ch are called for and the heating works, yes?
When ch only is called for then pump runs but boiler doesn't fire
It sounds as though your system was once gravity HW and pumped ch but has been converted to fully pumped (poorly)
There is a selector inside the boiler control panel to select between gravity HW or fully pumped, in the fully pumped position then the two live inputs to the boiler are permanent live and switched live
In the gravity position then the two inputs are ch switched live and HW switched live
This is how your control wiring may still be wired ie with two switched lives
As such it req looking at as it is not correct
Also worth noting is that if it has been converted to fully pumped and
1 the wiring has not been altered to suit
2 the internal selector switch has not been switched to the correct position
Then I would find it unlikely that
3 the overheat stat has been moved to its correct position either
You may be better getting someone in to look at it
Boiler fires when both hot water and ch are called for and the heating works, yes?
When ch only is called for then pump runs but boiler doesn't fire
It sounds as though your system was once gravity HW and pumped ch but has been converted to fully pumped (poorly)
There is a selector inside the boiler control panel to select between gravity HW or fully pumped, in the fully pumped position then the two live inputs to the boiler are permanent live and switched live
In the gravity position then the two inputs are ch switched live and HW switched live
This is how your control wiring may still be wired ie with two switched lives
As such it req looking at as it is not correct
Also worth noting is that if it has been converted to fully pumped and
1 the wiring has not been altered to suit
2 the internal selector switch has not been switched to the correct position
Then I would find it unlikely that
3 the overheat stat has been moved to its correct position either
You may be better getting someone in to look at it
Posting some pics of the wiring centre etc may be a help
Matt1e - Yes boiler fires for HW & CH, and HW only but not CH, but fan and pump operate.
System has always been fully pumped and until saturday was working fine.
What else can I check which adds to the CH call for heat cycle to cause the boiler to fire?
System has always been fully pumped and until saturday was working fine.
What else can I check which adds to the CH call for heat cycle to cause the boiler to fire?
The only thing that is "added" to the ch only cycle is the call for heat to the boiler from the valve, which won't be happening as long as the valve is in mid position
I have already explained this to you in an earlier post
Regarding the fan running,that should only run when there is a call for heat
It sounds s though you have multiple problems or you are mistaken about the fan
MisterDubya, sorry to disappoint you but this is a real situation, my CH is only working because the HW is making the boiler fire. As for the midposition on the valve, maybe I've misled by stating this, all I can say is that on CH only, the pump starts and the valve moves from HW (port B, default position), but boiler will not fire.
There is only one ( orange ) fire boiler wire from the motor valve!
We dont seem to have been clearly told if the valve really does move to the CH only position.
Even if it does, then the mechanical linkage inside may not be operating the microswitch.
Regardless, the only way forward is a test meter and someone who knows how to use it!
Tony
We dont seem to have been clearly told if the valve really does move to the CH only position.
Even if it does, then the mechanical linkage inside may not be operating the microswitch.
Regardless, the only way forward is a test meter and someone who knows how to use it!
Tony
Update - borrowed multi-meter from work, tested room stat and cylinder stat signals in wiring centre, both healthy 230+, however orange wire from valve reading 42-44, so now confirmed that boiler is not getting signal from valve to operate.
This is a new salus valve head on to the original valve body. Is there a way of checking if the valve is faulty, or should I just take it back to the supplier?
This is a new salus valve head on to the original valve body. Is there a way of checking if the valve is faulty, or should I just take it back to the supplier?
it needs a 230V supply on the white and the gray to give a 230V output on the orange
Matt
Matt
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