Micron70FF

[WillsNana]

We have a Micron70FF (2004 installation and new pcb in Oct 2005) with Horstmann H27XL series 2 programmer (2yrs old),. The boiler was serviced last Thursday and worked until after 7 this morning when it stopped and all the electric sockets went off. It now will not operate at all, just trips the electrical socket fuse.

We spoke to a sparky friend who suggested switching off the room thermostat (suggesting it could be a valve)and the electric stayed on until I turned up the hot water cylinder thermostat and the electric went off again. So it couldn't be the pump could it?

Homeserve suggested it was the system (valves/pump) and they would ring, but I wondered if it was the pcb or thermistor so we asked for a boiler engineer who can come Thursday!

Anybody got any ideas? You have been alot of help in the past but couldn't find my old log in name!

 

[seco services]

i would check the pump first.

 

[WillsNana]

Homeserve has a ridiculous system where you have to pick either a boiler engineer or a systems engineer (pumps,valves etc). I asked if we could have a systems engineer and cancel the boiler man if it was sorted but no, you can't. I may cancel our contact with them next year. At least our old plumber dealt with both!

 

[WillsNana]

Gloworm technical said
"that makes it more of a difficult problem to pinpoint as it could be either the boiler or the system unfortunately.

The only way to determine whether it is the boiler or the system would be to get your electrician to come round and remove the wire out of the boiler that goes to terminal "LS" on the boilers connection block, and then put a link wire from terminal "LP" to terminal "LS" This will bridge out your external system controls.

If the electrics still trip out once this is done, then it is a boiler fault. If the boiler fires up and works ok when this is done, then it is a system controls problem and not the boiler".

This may help anyone else withe the same problem

 

[WillsNana]

You were right SS. It's the pump.

 

[seco services]

have you got it sorted now ?

 

[WillsNana]

No they may come back today, or it may be tomorrow

 

[WillsNana]

They have been and installed the pump, but I notice the water pipe to the overflow seems hot.

If the pump had been installed the wrong way round, would it cause the pipe to do that or has the cold just raddled my mind? Or could it be air in the system getting out?

 

[WillsNana]

Not sure how include images with my post but this is how the pump looks...looking into the floor

http://www.diynot.com/network/WillsNana/albums/

I'm sure that the old one had the circular bit facing upwards, as you have to put your hand underneath to get at the three levels (1,2,3), so is this correct?

We've turned the level down to 1 (systems engineer told us what to do) as it's still bubbling on 2.

It's a Grundfos 15-60 130 cat no. 1/44/215 which replaced a

Terrier TC6 TF110 IP44 Class H