Alpha CD24C Red light on?

[leegsi]

We have an Alpha CD24C combie boiler.....

It was working fine until the RED B indicator started flashing.
I went through the reset procedure and the light stopped flashing but still no hot water.

We now have a constant RED A light?

 

[ianmcd]

Do you have any other gas appliances ? are they working OK red light on means burner has locked out

 

[leegsi]

Gas cooker that works fine

 

[ianmcd]

Have you had any elictrical work done in the last few days , smart meter or work near the boiler ?

 

[leegsi]

Nothing at all.

Other thing I had noticed was the pipe outside was dripping when the boiler was working.

Could it be related to the expansion vessel being at fault?

 

[ianmcd]

what is the boiler pressure guage reading, can you post a pic of the control panel on the front of the boiler

 

[leegsi]

I just tried another reset and RED A has now gone off.

Its now trying to fire up (Yellow C comes on) but clicks off after a few seconds.

It keeps trying till eventually it comes up with a solid RED B.

Pressure is in the green area.

 

[ianmcd]

Try taking the pressure up to 2 Bar ( you can release this by bleeding a rad ) reset and see what happens, the pressure sensors on these are terrible and sometimes show low water pressure when it isnt

 

[leegsi]

Tried that but no difference

 

[ianmcd]

then you need a gas safe engineer now, you have checked everything you can, unless you are holding the reset for more than 2 seconds ,

 

[leegsi]

Thanks for the help

 

[Davidandkeiley]

I had something similar happen to mine only last month and it turned out to be the low pressure sensor was blocked up. Ordered a new one from alpha for about £35 and had it fitted. Old one actually snapped off when they tried to remove it as the thread is plastic so made sure the new one was a brass fitting. Simple for them to test once boiler was opened up