Hi all. Sabre HE, when on AUTO no ch no hw, but it works fine-ish when on manual. Just happened last week when a friend came back from holidays. When on AUTO, he can hear the fan going but no ignition, but when on manual on both ch and hw, it fires up even if with a bit of delay and sometimes he has to reset it. Hw takes a bit longer to heat up than before. Also when on manual on ch only, it does not fire up. I have not been there yet, but that is the infos he has given to me. Any idea of what i should be looking for? He had a problem last year which was sorted once he got the APS replaced. Thank you for your time.

