Worcester 30cdi fan pressure

[sammathias]

Done a service last week on a worcester 30cdi.
FGA reading of 0.0006 meaning no need for a full stripdown.
Fan pressure of -2 meaning the heat exchanger should be cleaned. Baffled.....so anyway got a service kit and done a full clean, didnt seem necessary tho as it seemed reasonable clean.
What was the correct procedure, would the full clean of been necessary with a fga reading so low?

 

[Paulplumb]

if the fan pressure reading is not within manufacturers parameters then the HE needs cleaning. What was the fan pressure reading after the clean?

 

[sammathias]

In all fairness it was -4.6 after clean but shouldnt the the fga of been indicating a higher reading than 0.0006?

 

[Elgordo]

Did the ratio drop after cleaning the he?

 

[sammathias]

FGA after clean was 0.0005 so barely made a difference apart from the fan pressure.

 

[Elgordo]

One of those situations where there's no reward ,but you've done the right and safe thing - better than worrying about it later too .