addvent fault codes

[Andy AC]

I have had the misfortune to have been called to be called to an Addvent AVAC SPL18-N split system that had been supplied and installed by a nameless electrician - Why do they never have names?
System goes out on E3 fault, reset power, and away it goes. When I got to it, found the filters blocked solid and the fan motor making a terrible racket. Because of the noise, the electrician had somehow managed to get a replacement indoor unit, which was never fitted. I swapped the fan motor and cleaned the filters, put it back together and ran fine for about a week, and is now faulting on E3 again. Anybody know what that code is?
I thought it could be shutting down on the evap coil sensor because of the blocked filters. Haven't been able to check pressures yet - condenser is located up high, in an alleyway, which is only accessible by going through a little old lady's house, if she is up and dressed. The indoor unit cools well, does not frost up, plenty of moisture all over the coil, but no ice.

I know the next thing to do is check the pressures, but was hoping it's something on the indoor unit because of the access issue.

Any suggestions welcome.

Andy

[monkey spanners]

Is it from these people?

http://www.addvent.co.uk/

Couldn't find anything on their site though, might be worth giving them a call and see.

[Andy AC]

yep thats them, I'll give em a call in the morning