Only one working radiator

[CHRI1111]

Hello all,

I was hoping someone could help me solve and repair my central heating issue.

Only a single radiator works in the property in the bathroom.

This room is located directly above the boiler on the first floor. The boiler is located within the kitchen on the ground floor.

I notice when the boiler fires up the pump says 1 watt, then a few seconds later has two dashes.

All the other radiators are stone dead cold.

Any ideas?

 

[CHRI1111]

Correction-
A second radiator in the adjacent bedroom is warming up, to include its outlet pipe.

The third radiator in the second bedroom is cold, but notice the inlet pipe is luke warm. The central heating system has now been on for 30 minutes.

When I tested the system in Winter 2016 only one radiator got hot, so a little improvement since then for some reason.

Chris.

 

[ShaunCorbs]

Take the trv heads off and does the pin push down ? Also lift it till it stops don't force it up too much you should have heating

 

[JCplumb]

The only reference I can find to the 2 dashes shown in your pic is here:
http://us.grundfos.com/content/dam/GPU/Literature/ALPHA2/99187617_0217_ALPHA2_IO_Internet.pdf
It seems to be an indication that the supply voltage is too low.
Whether that's normal when there is no call for the pump to run I don't know. Hopefully someone else on here has more experience with this particular pump.
The fact that only one rad upstairs above the boiler is getting hot indicates a pump problem most of the time. Your boiler may also lock out during calls for heating because the hot water isn't dispersing quickly enough.
Doesn't look like you have access to check the return pipe temp while it's running.
I'd say most people would need to call a heating engineer in this situation.

 

[CHRI1111]

My boiler does keep cutting out, so I suspect the pump is either jammed or faulty?

 

[ShaunCorbs]

Try this

Press and keep pressing the grey arrow point so it fills the II mark

 

[CHRI1111]

This is the trv. Does push down.

 

[CHRI1111]

I've pressed the arrow some 40 times but nothing has changed on the display

 

[CHRI1111]

I've also put my hand on the pump and cannot feel it vibrating.

 

[ShaunCorbs]

I've pressed the arrow some 40 times but nothing has changed on the display

While it's on / got power?

 

[CHRI1111]

Yes

 

[ShaunCorbs]

This is the trv. Does push down.

View attachment 30631

Are the other trvs like this one easy to push down and up ?

 

[ShaunCorbs]

Yes

I would say new pump then sorry to say

Should adjust

 

[CHRI1111]

The other upstairs radiators don't have trv's - got these:

Not sure how to check these?

 

[ShaunCorbs]

That's fine there lockshield valves won't go wrong unless there shut (anti clockwise to open if your wondering) but if they've worked before leave them point to either controller not giving power to the pump or duff pump

Do you have a multi meter?

 

[steadyon]

Could be the bathroom radiator is on the hot water primary circuit with either central heating not called for or a duff motorised valve.

 

[CHRI1111]

I've never turned those off and the system used to work fine.

I don't have a multimeter unfortunately, would that be to check the power to the pump? I am wondering whether I can try and turn the pump manually to see if it's siezed but don't see a screw on the front to get access?

 

[ShaunCorbs]

I've never turned those off and the system used to work fine.

I don't have a multimeter unfortunately, would that be to check the power to the pump? I am wondering whether I can try and turn the pump manually to see if it's siezed but don't see a screw on the front to get access?

That's fine

And yes to eliminate the programmer any chance of another pic close to the bottom of the cylinder/ can you see a port valve

Like in the pics below?

 

[CHRI1111]

As in this thing?

 

[ShaunCorbs]

Yes can you hear that moving (should click and pump turn on)

 

[CHRI1111]

I think so. Very faint but there is a single click. Tried to upload sound file but won't let me.

 

[ShaunCorbs]

That's it, I would say pump but without checking the voltage to the pump can't be 1000% sure

 

[CHRI1111]

Is it worth checking whether the pump is seized?

 

[ShaunCorbs]

Is it worth checking whether the pump is seized?

The only way with the erp series is to take the pump out completely, there's not a manual air vent like the old series used to have

 

[CHRI1111]

Ah that's a shame. Oh well if im.takibg the thing off I may as well replace it! I've found a you tube video explaining how to replace, but I'm guessing I'l need to drain the system down as I can't find the isolation valves to the pump itself.