![]() The installer said they could not install a thermostat elsewhere in the room (checked.Rinnai does not make one or allow for such). I don't get any error code(s) but my Rinnai EX22CP was installed right beside my basement door, leaving the thermistor that senses the temperature near floor level and a small cold air leak. Too bad Rinnai can't just make a kit to extend the wiring and/or a thermostat to work with their units. The lead I added reads in the milli-Ohms, insignificant change to the sensing circuitry. I have quite a bit of electronics experience and read the install manual regarding the thermistor circuitry 1st! The thermistor's resistance should read between 10k and 100k Ohms. NOTE: I would not recommend this "Fix" to anyone who is not comfortable with electronics. If I set the unit to 66 deg.s, the room temp reads 68. ![]() Its setting does not match the thermometer near where I set the thermistor. It runs less often, less "hard" and maintains an even temperature. Although some have cautioned against "fooling with it", by cutting it off, leaving wire on each end to separate and strip (about 3/4"), splicing in a 6' twin lead 16 gauge lamp cord and relocating the thermistor away from the floor and cold air, the unit runs fine now. Finally having had it with the unit running too much when set to 62 deg.s, or not enough set at "Low", I read the install manual online and decided to relocate the thermistor (yellow twin lead wire to black thermistor) that sat near floor level at the back, left, of the unit.
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