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Assuming nothing is jamming the impellor it sounds like a capacitor fault. Sometimes these are built in to the pump which can be a pain to get to. Normally near the handle where the cable enters the pump. If your lucky it will be mounted in a control box. Small cylindrical item about 3 inches long. Prob around 10, 12 or 16 micro farad. Easy to change, 2 wires not essential which way round
you need to flush out the rinnai. to do this you will need 4 gallons of white viniger & a circulating pump. #1 disconnect the power. #2 close both incoming & outgoing water valves under the unit. #3 conect a drain hose to the out going flush valve ( flush valves are under the unit & have brass caps) #4 connect pump outlet hose to ingoing flush valve. #5 put pump incoming hose & drain hose from outgoing flush valve in a 5 gallon bucket. #6 pour 4 gallons of vinager into the bucket. #7 open both flush valves. #8 turn on the circulating pump & let viniger pump in the incoming flush valve through the rinnai & out the outgoing flush valve back into the bucket for 45 min. #9 disconct pump from incoming side & close incoming flush valve.( don,t close outgoing vaves at this time) #10 put out going hose in empty bucket. #11 open incoming water to flush viniger out of unit. # 12 disconct outgoing hose , close outgoing flush valve & open outgoing water valve. #13 clean filter & turn on power.
If the compressor does not run, it is an electrical issue. The relay might be bad. Is there power going to the relay/ compressor? Use a volt sensor to determine this. Before I would replace the compressor I'd replace the relay. "Johnstone Supply" has refrigerator parts. Is it clean? It almost sounds like the "overload" has tripped and is not resetting.