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Rinnai RU98i - Intermittent Cold Water Suddenly After Years Working
Anyone have any ideas on troubleshooting this problem? We have a Rinnai RU98i that has been working for 4 1/2 years now, and has been working just fine without any issues the entire time. Maintenance of cleaning the inlet filter and performing the service flushing has been done annually (last done 6 months ago).
Recently in the last two months, when taking showers (or washing dishes) the hot water suddenly goes cold for about 5-10 minutes. I just now followed to manual instructions to check the controller for error codes (model # MC-91-2US-S), but the 9 recent codes all show as blank with _ _.
Does anyone have any ideas to troubleshoot this problem, short of calling a technician? Someone came by today and quoted $ to perform maintenance, but they couldn't even ID the problem, so now I'm resorting to online help to try to narrow it down and ID the issue, and then pay a technician if necessary to actually fix the problem.
Any suggestions would be greatly appreciated! Thanks in advance