PHE Sensor replacement

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PHE Sensor replacement

Post  sllimeel on Wed Nov 21, 2012 10:34 am

Can anyone give me the procedure for replacing the PHE sensor?

Many thanks.

Lee.

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Re: PHE Sensor replacement

Post  mike on Wed Nov 21, 2012 2:38 pm

Yes block off the cold feed and vent.
Then carefully undo it and fit new one.
Or if not sure, drain unit and fit it.
Mike
MGC/H2O
Norfolk

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Re: PHE Sensor replacement

Post  sllimeel on Tue Nov 27, 2012 10:38 am



Ok, next question. How do i remove the wires from the sensor block?

Many thanks

Lee.

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Re: PHE Sensor replacement

Post  mike on Tue Nov 27, 2012 10:47 am

In the bottom right hand side of your picture.
I think I can just see the plastic tool to remove / fit the wires.
But if there are not screws.
And the tool can not be used.
Then a thin bladed screw driver.
Mike

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Re: PHE Sensor replacement

Post  sllimeel on Tue Nov 27, 2012 10:56 am

Mike

The block pictured has smaller terminals so the tool is to big for this block. Do i insert the screwdriver from the bottom or in the slot just above each terminal?

Thanks

Lee.

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Re: PHE Sensor replacement

Post  mike on Tue Nov 27, 2012 10:59 am

In the middle of the block next to the wire

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Re: PHE Sensor replacement

Post  sllimeel on Tue Nov 27, 2012 11:02 am

Many thanks, i just got the first one out.

Lee.

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Re: PHE Sensor replacement

Post  sllimeel on Tue Nov 27, 2012 11:42 am

PHE sensor all change out, and.....the first complete hot shower in a while! Thanks Mike.

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Re: PHE Sensor replacement

Post  MWB on Thu Dec 13, 2012 8:09 am

Hi,

I think I have the same problem.

When you say

"Yes block off the cold feed and vent.
Then carefully undo it and fit new one.
Or if not sure, drain unit and fit it."

What do you mean by "block off the cold feed and vent"?

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Re: PHE Sensor replacement

Post  mike on Thu Dec 13, 2012 11:06 am

On the F & E tank
Block off the vent and cold feed.
Only if you know what you are doing.
Mike

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Re: PHE Sensor replacement

Post  MWB on Tue Dec 18, 2012 12:14 pm

Thanks for you reply. I enclose 2 photos.

Above the boilermate there are 2 pipes. The left pipe has a sticker "Cold Feed and Expansion". It looks like it has an isolator screw. The right pipe has a sticker "Open Vent" with no isolator screw.
I also have some sort of small expansion tank in the loft.

I would like to replace the sensor that feeds into the pipe with the green oxidation on it.
This sensor sometimes comes up with an error on the ACB and I would like to replace it and it will not release water into the radiators. I may even replace the other similar looking sensor further down.

I am assuming that if I unscrew it water will spurt out and keep on spurting?

Can I isolate it so I can replace it easily?

Any advice would be appreciated?

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Re: PHE Sensor replacement

Post  mike on Tue Dec 18, 2012 12:19 pm

No photos.
But the isolator you describe turn the cold feed off from the F & E tank.
The vent needs to be banked off.
There are kits for doing this.
Or you may be able to use a stop end or sinmilar.
Mike

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Re: PHE Sensor replacement

Post  MWB on Tue Dec 18, 2012 1:06 pm

Sorry Mike I cannot get a photo to upload. I've just read you FAQs on how to do this but I don't have access to a public server to link to.

The other pipe is just fitted with a nut - no isolator. What do you mean by "banked off"? Is there nothing I can do to stop the water spurting out?

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Re: PHE Sensor replacement

Post  mike on Tue Dec 18, 2012 5:56 pm

sorry typing error.
Blanked off.
If not drain it out to fit as per the book

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