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Rinnai tankless shutting off.
Happy? Sunday. I've had a problem with a 7 months old Rinnai tankless for about 4 days now. Not having any luck with any online troubleshooting. Hot water will start and flow for just under 6 minutes, then the unit itself shuts off completely. No error codes come thru. Cleaned the water inlet, not too bad. Plugged and unplugged. Plumber who installed will not return any calls. Any advice would be appreciated.