worcester 28i junior

[vern]

When the i juniors lock out, occasionally, and with no particular pattern, run the heating for around 15 minutes, take off the combustion cover, open a hot water tap and see if the fan stops, fairly common fault but a swine to catch if you dont know it, the fault lies with the board and the aps will sometimes have been heat damaged by the flames coming back around the combustion chamber, everything else except the aps is heat resistant and doesnt get affected.

Correct Derek its the fan relay on the board, now upgraded on replacements

 

[vern]

If you get flame failure on the i junior rsf, reset, wait for the attempted igniition, put your fingers behind the front panel, thumb at the front and squeeze the control board box, if it starts crackling and then fires up, its the board playing up.

This works on older CDi's too, the customer will also complain of buzzing or a strange noise, this is the relay chattering

 

[Derek Hardman]

Derek should those little gems be on the boiler breakdown sticky?

errm! Errr! Yes, but I dont know how, lol