Question about Rinnai RHFE-431FAIII 16,700 BTU Direct Vent Furnace Energy Saver Heater - Natural Gas

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Doesn't shut off when hits thermostat temp

I set it at low and it kjust keeps running. Just started doing this - not shutting off when it hits the temo it is set at

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Remove the top section of the heater. You will notice at the lower Right Hand of the back of the heater a small black plastic bulb with a yellow wire. This is the sensor fot the unit. Take a microwavable bean bag and heat it up in the microwave to a temperature a little greater than your body temperature. Place the bag on the bulb and then try and start the heater. If the heater does not start, your sensor is working but may need to be relocated. If it still runs, call a technician.

Posted on Aug 30, 2007

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THESE HEATERS HAVE A COPPER COLORED REMOTE SENSING BULB THAT HAS TO BE MOUNTED IN THE AIR FLOW. THEY ARE ONLY HELD ON WITH 2 CLIPS AND CAN BE KNOCKED OUT OF POSITION ... TAKE OFF THE FRONT COVER AND MAKE SURE THE BULB IS IN THE PROPER MOUNTING POSITION.

Posted on Apr 28, 2007

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Posted on Jan 02, 2017

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1 Answer

Does this model shut off automatically when the desired room temperature is reached or does it function on a low medium high type of thermostat that continuously runs? IR 3 0 p m d g - 1


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Bruce, what you may be hearing is a short cycling of the fan and not a short cycling of the system. The fact that you indicate it only does it once per cycle kinda suggest that. If the ENTIRE unit was shutting down, it could indicate an adjustment in the 'heat anticipation' circuit on the thermostat sub-base was required. The heat anticipator is an adjustible resistor on non-digital thermostats that warm the spring that rotates the mercury bulb to cause it to shut off just a little bit before attaining setpoint...thus 'anticipating' the shut down temp and not 'overshooting' the setpoint.

Too low of a setting and the system will short cycle, too high of a setting and the system will overshoot the setpoint. The typical setting is .4 amp which is where the majority of sub-bases are set at from the factory.

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If the fan and compressor are shutting off. its possible its cycling on a low pressure switch. probably low on freon.

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1 Answer

Air conditioning condenser always runs, never shuts off


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1 Answer

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