I've two Arcam A19 amps which are great. Their technical support less so. I've a Marantz receiver which uses the same RC5 codes for the remote. Cue hilarity. Fortunately, the A19 has an option to switch to an alternate RC5 code, which is easily accessed by pressing a couple of buttons on the front. The down side? While you can change the code on the amp, you can't change the code on the supplied remote, rendering it useless. So I contacted Arcam.
"Do you have a remote which supports the alternative codes on the A19?" "No" was their response. "Okay, can you recommend a universal remote control which will cover these codes?" "No, we can't recommend a remote control from a different manufacturer". "Can you confirm the alternate RC5 codes in the manual?" "No we can't help you with that". Thanks a heap.
Fortunately, as the manual had the alternative command codes so I thought, "I'll see if Logitech can assign them to my Harmony remote". Of course, the codes in the manual were wrong. A manufacturing revision had changed the prefix code, and the manual hadn't been updated. I contacted Arcam again. "These alternative codes aren't working, can you advise what the new ones are? "We don't know what they are, you'll need to bring your amp to a service agent for a firmware downgrade". "Presumably that's free? " As your amp is out of warranty, it's £150".
I ended up downloading a remote control app for my mobile phone, and trying all the combinations of RC5 codes until I found ones which worked. I noted them, passed them across to Logitech Support who, after some backwards and forwards, got them to work on my Harmony remote control.
Arcam technical support? Not recommended. Logitech Harmony support and the two guys I dealt with, Denis V and Lokesh? Wow. Best after sales service I've ever had.