Fixing a Worcester 24i boiler. Fan stops working, water runs cold.
by, 11th May 2013 at 11:33 PM (3738 Views)
Posting here as Edugeek is well indexed by Google and this might be of help to someone with a boiler problem.
The fan of a Worcester 24i combi boiler intermittently cuts out. This causes the fail-safe to trigger and the boiler to shut down, and the water runs cold. The fan may restart, the boiler might re-ignite, but cuts out again and the fail-safe shuts down the boiler.
Plumber says the best case scenario is a new control board (£150), worst case is a new boilder (>£1,000).
I wasn't having any of that so I thought I'd try and fix it. I found the fan fault was caused by a relay burning out.
The relay you need is
DPDT power relay, 5A 24v DC
Man Part No G2R-2 24DC
The RS stock number is 366338 http://uk.rs-online.com/web/p/non-la...elays/0366338/
The relay costs less than £5.
You will also need a soldering iron and a solder-sucker.
DISCONNECT THE MAINS POWER! Electrocution can spoil your day.
Make a note of the power connections to the main board.
Remove the metal board cover and remove the circuit board (very fiddly task)
The fan is controlled by a relay, circled in the photo below
De-solder the relay by removing the solder on the 8 joints shown in the photo below
Solder the new relay into place, reconnect everything.
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