Underfoor Heating Wiring Centre

[LED Lighting]

Hi All

Got an issue with a OJ WLM2 Hydronic Master Underfloor Heating Wiring Centre.
When you activate one zone using the room thermostats, the system kicks in and starts heating up the boiler but within 10 minuets the system shuts down!

For reference:
Electric Boiler 13KW (single phase) with 230v switching (not volt free)
Pump
motorised valve
4 Room Stats
5 Heating Zones controlled (2 zones for the lounge off the same stat)

Any help would be greatly appreciated.


If anyone is wondering why a qualified electrician is "messing" with the underfloor heating control centre, this is because in the last 6 months Gas Safe has told all their plumbers in this area that they are NOT to do any electrics, and all the plumbers around here have handed this over to their electricians.
We are in a small area and have no Plumb-elec companies around here and I have been landed with this lovely job.

 

[HandySparks]

What testing have you done already? For example, what happens to the switched control line into the boiler when it cuts out?

 

[Leesparkykent]

As above is there voltage present on the switch line when the boiler cuts out?

 

[LED Lighting]

Hi All
Sorry for the delay, the voltage drops out on the S-Live when the boiler drops out, but the control centre states that there is still demand for the boiler and the pump is still running.

After speaking to Tech today it has been determined that the control centre has packed up!

and since this control centre is discontinued, What control centre would you all recommend is the best to use.

At present the cables installed are 0.75mm twin core (no cpc) so SELV is the only option or wireless battery. It must also be simple to install and commission

 

[Leesparkykent]

Hi All
Sorry for the delay, the voltage drops out on the S-Live when the boiler drops out, but the control centre states that there is still demand for the boiler and the pump is still running.

After speaking to Tech today it has been determined that the control centre has packed up!

and since this control centre is discontinued, What control centre would you all recommend is the best to use.

At present the cables installed are 0.75mm twin core (no cpc) so SELV is the only option or wireless battery. It must also be simple to install and commission

Did you also check if the voltage drops out on the brown of the valve?

 

[Leesparkykent]

If you want to replace with wireless I would look at Heatmiser UH8-RF.

 

[LED Lighting]

Did you also check if the voltage drops out on the brown of the valve?

The supply voltage to the "voltfree relay" remains, but the switch live disappears. I personally think the relay is failing.

 

[wespark]

Hi Guys, hope you don't mind me making a suggestion, but is it possible one of the room stats in the house is an override stat? I've connected one or two of these systems and building control insisted this was installed as was part of the electric boilers control system!

 

[LED Lighting]

Hi Guys, hope you don't mind me making a suggestion, but is it possible one of the room stats in the house is an override stat? I've connected one or two of these systems and building control insisted this was installed as was part of the electric boilers control system!

Everyone's suggestion is very much valued!
All the states are the same model number and are unique to the control centre.

Thanks all the same

 

[Uheat – Jake]

Take a look at our 8 Way Wiring Centre, if the connections are the same or simular it could just be a straight forward swap.
8 Way Wiring Centre - http://www.uheat.co.uk/8-way-wiring-centre/

If you want to replace with wireless I would look at Heatmiser UH8-RF.

Totally agree with Lee, if you want to replace for a wireless system, Heatmiser is the way to go.