No power to Manifold

[fowlerboi]

Have you checked you have 240v going into and out of the room stats? They might be switching via low voltage battery or the relays aren’t working. You need to trace the electricity step by step forward or backwards in the switching order

 

[Bradders123]

Thanks for this - Yep, checked all room stats and there's no 240V either in or out at the back and not at the manifold side either. I'm still thinking that the 240V is going missing between the consumer unit and the understairs power switch - which is why I was thinking that there's a timer somewhere?

 

[ShaunCorbs]

Has the boiler get power ? / picture of it please

 

[Bradders123]

Has the boiler get power ? / picture of it please

Yep both boilers have power, but they work independently from the manifold. They only deliver heat to the manifold and the manifold distributes it as necessary. There are no electrical links between the boilers and the manifold.

 

[ShaunCorbs]

Yes there should be else how does it know to heat up sounds like it’s not been wired right from day one

 

[Bradders123]

Yes there should be else how does it know to heat up sounds like it’s not been wired right from day one

Thanks. Like I say, I've had this setup for 20 years now with no real issues. Originally the boiler was in a 'hot running'configuration, constantly supplying heat on a primary loop to the manifold heat exchanger. The manifold is on a seperate hot water circuit and decides whether to distribute the heat or not depending on what the room stats are asking for. In this setup there is no need for the manifold to talk to the boiler. When the temperature in the primary loop drops, theboiler comes on and tops it up.
About 10 years ago, I changed to the wood pellet boiler and decided it could run cheaper, so set times on the boiler controls when to come on and off. I then set the room thermostats to only call for heat during these times. The operation and wiring is the same though, just at specified times.

It's been fine for 20 years, but the power to the manifold has gone now. I'm now wondering if its as simple as the wall monted power switch under the stairs. I'll check that tonight.

Thanks

Graham

 

[Bradders123]

Thanks. Like I say, I've had this setup for 20 years now with no real issues. Originally the boiler was in a 'hot running'configuration, constantly supplying heat on a primary loop to the manifold heat exchanger. The manifold is on a seperate hot water circuit and decides whether to distribute the heat or not depending on what the room stats are asking for. In this setup there is no need for the manifold to talk to the boiler. When the temperature in the primary loop drops, theboiler comes on and tops it up.
About 10 years ago, I changed to the wood pellet boiler and decided it could run cheaper, so set times on the boiler controls when to come on and off. I then set the room thermostats to only call for heat during these times. The operation and wiring is the same though, just at specified times.

It's been fine for 20 years, but the power to the manifold has gone now. I'm now wondering if its as simple as the wall monted power switch under the stairs. I'll check that tonight.

Thanks

Graham

OK, I think I might be getting somewhere now. I removed the switch plate from the wall power switch under the stairs. The switch had continuity, so all good. However, with the power on at the consumer unit I'm only getting 8V AC into and out of the switch.

Reckon it must be a bad circuit breaker or ground connection in the consumer unit. That's what I'm going to try next, so I'll report back on whether it's been successful or not. Cheers.

 

[ShaunCorbs]

The boiler and pellet boiler wouldn’t work so not circuit breaker / mcb

 

[Bradders123]

The boiler and pellet boiler wouldn’t work so not circuit breaker / mcb

Since the boilers were moved to the garage, they are on a seperate mcb and consumer box in the garage. Cheers

 

[Bradders123]

Hi folks, thought I's just close this out with an update. I've now resolved the issue and everything is working fine. Seems that when the oil boiler was moved to the garage, the appliance power switch that was left in the utility room and I didn't think did anything, actually did. At some point I've switched that off as there's no boiler there and it's broken the cicuit from the consumer unit to the understairs manifold. Kicking myself that I never reailsed this earlier, but it's all good now. Thanks for all the assistance.

Cheers

Graham