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Alpha boiler Hi, I have an Alpha SY9-24 boiler. The water pressure is fine when just heating water but when heating the rads it goes all the way into the red. I assume this is not correct, any ideas?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 171 Answers

SOURCE: How to re pressurisecentral heating system

Hi tiger650,

I'm Harvey the Master Plumber.

Your problem is: The Alpha SY24 boiler has stopped working. The pressure gauge has dropped, you need to know how to re pressurise the system once the radiators have been bled

Every hydronic heating system is required to have a presure regulator. Most guys call it a feeder valve. Every one I've installed or worked on had one. It's job is to keep the water pressure constant by adding water when you release some air without over filling the system. Sounds like it's not working. Some types can be serviced, others cannont so you may have to replace it. If you're not sure what to do it might be prudent to check the Repair Directory for a repairman.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

Posted on Sep 27, 2008

tborn6
  • 700 Answers

SOURCE: alpha boiler - wireless programmer failing

it sounds like the problem may be in the boiler and not the controller itself. Do you kno which is are the two wores that are the r-w for the thermostat take and purt them together and see if the boiler stays on or shuts off like it does with the thermostat. If it does then replace the reciever. If it doesn't then you have another problem. Good Luck

Posted on Jan 07, 2009

  • 150 Answers

SOURCE: alpha 240e boiler wont fire up for hot water, will for heating

most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Posted on Sep 02, 2009

  • 150 Answers

SOURCE: i have a alpha cd32 boiler,and i keep having to

Pressure relief valve - replace
The internal seal gets bunged up with dirt & scale and then leaks water [pressure] to that outside pipe
To avoid draining the whole system, turn off the two central heating taps on the 3/4 pipes and then operate the valve manually and / or disconnect - only a small amount of water will escape / drip to below the boiler
Replace valve and fill as before.
If you think your system needs flushing out - now is a good time
Turn off mains electricity to boiler before starting work

Posted on Mar 07, 2010

packrat1948
  • 528 Answers

SOURCE: My alpha cd32 boiler is 5 yrs old but now it keeps

I would replace the relief valve or remove it to see if it is plugging up.
Buy some cleaner and run it through if you have not done it in a while.
Do the other anyway.

Posted on Feb 02, 2011

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1 Answer

I had an issue with turning off the fill valve on my alpha boiler and the pressure went to 1.5 bar when cold and rises to 2.75 when the heating comes on is this ok.


You need to check with the boiler/system specifications to discover the correct pressure.

An overpressure condition should be dealt with by a safety valve that usually vents to the outside of the building - if it is working correctly. There have been incidents of this external vent freezing causing dangerous pressure to build in the system. I understand a modification is simple and inexpensive but I don't know any details.

Our pressurised system runs at about 2.5 bar hot, or at least it used to do when it was younger...

Jan 25, 2017 | Water Water Heaters

1 Answer

Alpha cd28c boiler loosing water and pressure through pr valve when heating is on,and when then switched off needs repressuring to use heating again.no obvious leaks.new pr valve been fitted.pressure


I assume losing pressure through the PR means Pressure Relief Valve (PRV) or temperature pressure (TPR). Open in TPR may mean boiler is overheating/overpressurized. Open in PRV means the Pressure Reducer/Fill Valve in the fill line of the boiler is broken.
House Water Pressure in a home is 30/40 PSI min to 60-80+PSI max.
Boiler PRV/TPR are set at 30 PSI open (SYSTEM PRESSURE) so too high a house water pressure will open the PRV/TPR. Replace the reduction regulator on/in the fill valve assembly

Oct 20, 2014 | Water Heaters

1 Answer

My alpha cd32 boiler is 5 yrs old but now it keeps registering high pressure on the gauge when the heating is running. It is on the green when cold but goes up to 3/3.5 when running the heating. There is a...


I would replace the relief valve or remove it to see if it is plugging up.
Buy some cleaner and run it through if you have not done it in a while.
Do the other anyway.

Feb 01, 2011 | Watts 3/4 Pressure Relief Valve

2 Answers

My worcester bosch 24i junior pressure keeps dropping if i have heating off for an hour i have to top up boiler and reset also when i have heating on the pressure jumps right up to over 4.0bar


When water is heated it expands. To deal with this all boilers are fitted with a small expansion vessel which is like a reservoir which holds the excess water.

This expansion vessel is like a balloon in a metal pot. When the water goes in the metal pot the baloon squashes a bit to make room for the extra volume of water. When it cools the balloon pushes the water back into the heating system.

What has happened is your expansion vessel no longer works. When the water heats up there is nowhere for it to go so the pressure jumps up to 4 bar. The Worcester boiler lets high pressure water escape (most boiler allow this to go through the safety valve at say 3.5 bar).

When the water cools the pressure drops very low as the volume of water contracts.

The problem is your expansion vessel - normally a little red painted metal cylinder inside the boiler.

Dec 22, 2010 | Bosch Water Heaters

1 Answer

I have a alpha cd32 boiler,and i keep having to top the water up within the boiler,so to get hot water and heating again.i have checked for water leaks and nothing is found,however i did check the outlet...


Pressure relief valve - replace
The internal seal gets bunged up with dirt & scale and then leaks water [pressure] to that outside pipe
To avoid draining the whole system, turn off the two central heating taps on the 3/4 pipes and then operate the valve manually and / or disconnect - only a small amount of water will escape / drip to below the boiler
Replace valve and fill as before.
If you think your system needs flushing out - now is a good time
Turn off mains electricity to boiler before starting work

Mar 07, 2010 | Watts 3/4 Pressure Relief Valve

1 Answer

Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

Sep 06, 2009 | Water Heaters

2 Answers

Alpha 240e boiler wont fire up for hot water, will for heating


most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Aug 21, 2009 | Water Heaters

1 Answer

Alpha boiler - wireless programmer failing


it sounds like the problem may be in the boiler and not the controller itself. Do you kno which is are the two wores that are the r-w for the thermostat take and purt them together and see if the boiler stays on or shuts off like it does with the thermostat. If it does then replace the reciever. If it doesn't then you have another problem. Good Luck

Jan 05, 2009 | Water Heaters

1 Answer

How to re pressurisecentral heating system


Hi tiger650,

I'm Harvey the Master Plumber.

Your problem is: The Alpha SY24 boiler has stopped working. The pressure gauge has dropped, you need to know how to re pressurise the system once the radiators have been bled

Every hydronic heating system is required to have a presure regulator. Most guys call it a feeder valve. Every one I've installed or worked on had one. It's job is to keep the water pressure constant by adding water when you release some air without over filling the system. Sounds like it's not working. Some types can be serviced, others cannont so you may have to replace it. If you're not sure what to do it might be prudent to check the Repair Directory for a repairman.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

Sep 27, 2008 | Water Heaters

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