28 cdi fault

[jamiesmith]

Hi can anyone help!
My 28cdi has an intermitant fault where the tap light flashes fast in DHW or CH mode and I then lose heat this happens mainly in the morning when I put the DHW on. Any ideas want it could be.

 

[adlplumbing]

anything and everything
from pcb to slightly sticking diverter vavle impossible to say as part is going but without being their when it`s broke i could not give definite answer

 

[jamiesmith]

I spoke the an engineer and he said it sounds like the pressure switch

 

[adlplumbing]

if you got manufacture instruction you could have look in their and might tell you just rembered some worster use flasing light`s as fault code bit annoying though

 

[kevindgas]

standard or HE CDi?
if standard will look up the codes for you as have manual
if HE then try worcester's website

 

[jamiesmith]

Thanks will have a look

 

[jamiesmith]

Its a 28 cdi RSF The book indicates fail point j "Air Pressure Fault"

 

[kitch0978]

probably air pressure switch, small blockage in aps tubes or flue restriction

 

[kitch0978]

sorry, didn`t see your last post

 

[adlplumbing]

fairly cheap fix get local bod to change it in the morning if the fault is with
the presure switch never rule out pcb though

 

[jamiesmith]

Thanks all will call someome tomorrow

 

[ollski]

yep fast flashing hot water light is a slow fan or air pressure swith or one of the pressure switch tubes cracked / split. Does it do it during a demand....is the fan noisy?

 

[jamiesmith]

Only on demand the fan doesnt seem noisey and seems to happen more when cold