Hi, thanks for the information. The mistake I'd made is put the board back into the drier without measuring the pin layout, thinking that I'd easily find a datasheet for the NF relays where I could match up a relay, but couldn't find one at all. Then from my usual suppliers (I've not used Rapid before) I put in 9VDC coils and there wasn't much to choose from.
The four square relays are all the same size, but my problem is for 9v coils, is now finding the 16a ones in case I need to replace them all, but same issue with finding datasheets for those ones also. They're not the kind where you can pop the lid off and clean the contacts out! But the issue is most likely one of the 10amp ones. For the cost and whilst I have the board out, I'd intend to replace them all.