We use three Rinnai C199s to heat our HLT, mostly by recirculating the castback water through them, but also for directly heating make-up water when we run low. Ours have now decided that they like heating hot water, but not cold. When fed on 50F city water, the flame will come on, then go out. The flow throttles all over the place when this is happening.
The units do not give an error code when this happens, and they work fine when heating our 160F castback cooling water to 185F.
I clean these every two weeks with a 2.5 pH solution of inhibited sulfomic acid, so they should be nice and clean.
I've spoken to our Rinnai rep, but he seems as puzzled as me. The units are a little over 1 year old.
The units do not give an error code when this happens, and they work fine when heating our 160F castback cooling water to 185F.
I clean these every two weeks with a 2.5 pH solution of inhibited sulfomic acid, so they should be nice and clean.
I've spoken to our Rinnai rep, but he seems as puzzled as me. The units are a little over 1 year old.
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