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Rinnai RL94 Controller flashing with no error code
We bought a house with a Rinnai water heater. This morning I got up and there was no hot water. The controller keeps flashing with NO error code. My husband went outside (it's mounted outside) and turned it off. He came in, tried the water and it was hot. While letting it run, the water stopped. We turned the water off and then turned it back on and it was running hot again. The controller keeps flashing though. We called Rinnai and they didn't know why (controller out of warranty). They told us to call a plumber to look at it. I really don't want that expense if my husband can fix it. Any suggestions? I know it would be helpful if there was an error code, but there isn't. Thanks for any help or suggestions.