Combi Boiler with CH, but no HW

[yj6aa]

I have a three year old icon 23t boiler, which was serviced under a month ago. Currently there is no hot water, but the central heating is working just (not very hot). I have noticed that the boiler is firing up, for three to five seconds and then shuts down (The safety lockout light does not illuminate) and its doing this regularly until the CH is up to temp.

I have checked the Flue and it seems clear, and the gas supply seems OK. I have changed the settings to hw only and tried it with and without the timer to no avail.

Any ideas would be of help.

 

[croydoncorgi]

What system pressure is showing?

 

[yj6aa]

Pressure indicated as 1bar, 1.5-2bar working.

 

[kevplumb]

is the pump any noisier ?

 

[yj6aa]

no

 

[yj6aa]

Found out that it was a faulty PCB and Ignition unit. Also found out that the gas tap was leaking.

The boiler had been serviced a month previously, should this had been picked up?

 

[kevplumb]

leaking gas tap should have been
pcb can go at anytime

 

[yj6aa]

thanks kevplumb.