Rinnai's technical service was initially dubious but conceded that they couldn't come up with anything better so thought it was worth a try. I drew his attention to "therinnaiguy" comments regarding the wiring harness and possibly sparker and he thought there was some logic in those parts causing the sequence of events I had witnessed during a shutdown. On his first visit he had cleaned everything including the optical flame sensor which he thought might have been the problem. The Tech said when the thermostat called for heat the fan came on, followed by the gas valve opening, followed by the sparker attempting to fire up (Click) but failure to light. My observation of an involuntary shutdown was as follows:Unit ON but gas burner not lit temperature cooled to below thermostat setting unit fan came on for about 10 seconds then clicked followed by shutdown. Additionally during his second visit he was in telephone contact with Rinnai technical service. The Tech I had working on the unit seemed to fully understand the circuitry and sensors. When the heater shuts off on its own I have to turn the shut off knob to OFF, move the temperature control to high and turn the knob back to ON. Thanks Jadnshua for your response and analysis which I appreciate. Just like yesterday's car mechanic, unless he is smart and willing to learn, today's electronic devices can be hard to understand and old school can't cut it on these high-tech devices all the time.
RINNAI ENERGYSAVER 431F BLINKING RED LIGHT TRIAL
Trial and error in replacing potentially expensive parts is not the best way to fix it, either - you've got to throw some understanding in along with it. If you can't do it, it can get expensive finding someone who can. You need to read the theory of operation and then diagnose. Just in that one component, it could be the controller not sending the signal to ignite, the igniter could be dirty and not spark (or glow if it is that type), the gas valve could be dirty and there isn't enough gas, the flame sensor could be bad and even if it did light, it couldn't sense it. An intermittent problem is the hardest to diagnose.Ī faulty igniter is only one possibilty. Reviewing those and their sequence is critical to discovering what's going on.
RINNAI ENERGYSAVER 431F BLINKING RED LIGHT SERIES
If there's a circuit board, often there are a series of lights that show you what's going on. in the circuit, and any one of those could trigger the system something's not right and shut things down.
There may be flame decectors, pressure sensors, overheat sensors, etc. A closed combustion system is more complicated than one with an atmospheric flue, for example. Reading and understanding the interlock and start/stop routine of the system can go a long ways towards isolating the problem. Modern systems often have many levels of safety interlocks. Once it does happen, do you have to reset something to make it work, or does it self-recover eventually? Have you been down there when this happens? It is often easier to evaluate if you can see it happen. Many of the things have a fairly decent troubleshooting section in their manual.
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