Depending on your own opinion, here is some good news for all those people out there who seem to have had the same problem as me regarding the APM6855.
I have had two of these models in a 4 year period. The first was replaced under warranty after 11 months after incurring the same fault with the fridge indicating 'H' and not cooling down properly.
The 2nd came up with the same problem 3 weeks ago and despite an engineer visiting twice and each time resolving the problem temporarily, the appliance has now broken down again with the same fault. The engineer has now indicated that the repair of the machine is not cost effective and therefore needs replacing.
Unhappy with this result, I have now approached Howden's Joinery where the appliance was purchased. After some deliberation, they have agreed to replace the appliance at cost price, therefore no loss for them and at a hugely reduced price to me. As the problems seem to mainly occur with the frost-free model I have opted for the non frost-free which I also have in another property and have had no problems with (APM6852 or HJA6852).
Howden's cost prices are around £225 for the frost-free and £160 for the non frost-free excluding VAT.
Therefore, with an old machine of 3+years being replaced for a relatively nominal figure and complete with a new 12 month warranty, I see this as a reasonably fair result. Although I appreciate some people would prefer to move away from this model completely, interestingly though there are only a couple of posts regarding the same issue with the non frost-free model so fingers crossed!
Anyway I wish you all good luck with your own endeavours and hope you achieve a similar result.
Phil
April 2009