Potterton Profile 60E, pressure switch not switching.

howieleem · 5 Mar 2007

I have a Potterton Profile 60E with fanned flue. The old fan works ok, the pressure switch is new. On startup the fan runs, but there is not enough pressure going up through the heat exchanger and up the venturi to operate pressure switch.
If i blow up the tube to the pressure switch the switch changes over ok.
I have cleaned all the debris from between the heat exchanger fins.
I have sealed the boiler front cover.

clf-gas · 5 Mar 2007

Is it the correct pressure switch, set to the correct pascal.
compare old for new.

did you reconnect tubes correctly, +/-

howieleem · 5 Mar 2007

The pipes are connected correctly, and if i connect a tube to the red input and blow gently the boiler fires up.
So i guess the problem is either fan not powerful enough, or switch not sensitive enough.
The pressure switch is the same as the original.

Those pressure switches have an adjustment on the back for pressure, but i should not have to change that for it to work.

is there any other factor that can affect the lack of air pressure to the venturi.

wobbin · 5 Mar 2007

Perished tubes where they connect to the flue ? (behind the fan asembly)

Had that on our Profile 50e....

Regards,
Robin

baxpoti · 5 Mar 2007

howieleem said:
The old fan works ok, the pressure switch is new. On startup the fan runs, but there is not enough pressure going up through the heat exchanger and up the venturi to operate pressure switch.

Then the fan would appear not to be OK!

howieleem · 5 Mar 2007

Tubes are fine, no kinks, aluminium pipes between flue and pressure switch have no leaks, its a mystery.

Is it possible the fans lose power with age?

baxpoti · 5 Mar 2007

howieleem said:
Is it possible the fans lose power with age?

There's an easy way to find out.........replace it!

howieleem · 5 Mar 2007

Yes i worked that out a while ago, i wondered if any experts out there had come across the problem before.

baxpoti · 5 Mar 2007

howieleem said:
Yes i worked that out a while ago, i wondered if any experts out there had come across the problem before.

Fans tend to just give up and stop working, however.....
there was a very similar post to yours on here a few weeks ago, op changed the fan and bingo!

chaps · 5 Mar 2007

one of the pipes from air flow switch has a restrictor in it, a lump of brass with a pin hole for the air to move through, to allow the fan to run for a short time and clear any gasses/fumes before next combustion. this hole may be partially blocked, have a go at it with a pin or something. i been a heating engineer since 1988 and i never come accross a fan "not strong enough", if its spining fast its prob ok, have a look at the restrictor, maybe temp remove it for test reasons!! its also used to join two pipes together so you may well find it at a joint behind the airflow switch.

howieleem · 5 Mar 2007

I checked the restrictor and could blow through it so i guess it is ok.
I am going to have to go the new fan route.

jonseyrs · 5 Mar 2007

I've come across a number of faulty fans that appear to be working but are not running at a sufficient speed. It seems as though this is probably the case with yours.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Potterton Profile 60E, pressure switch not switching.

jonseyrs

Similar threads