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Robertshaw thermostat RS5110 temperature not droping when ac is on

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My robertshaw 9620 thermostat is stuck on 70 and i can not change setting frim temp or time.


Here's how I fixed my Robertshaw thermostat that was stuck at a 70 degree reading for almost 2 monthes. When I turned on the air conditioner or heater it wouldn't stay on. I removed the cover panel and dusted off the inside which the guy at local hardware store suggested. That didn't work. Then I noticed the words "reset" right on the green circuit board on the left side. There's a very small silver button. I pressed on it and everything reset. Less than a minute later the thermostat is reading the correct room temperature. Now my air conditioner and heater are working properly.

Mar 16, 2014 | Robertshaw 9620 digital...

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Robertshaw thermostat


Make sure you are not getting any flash codes @ the furnace...could just need a cleaning. (Remote Sensor)

Dec 15, 2013 | Heating & Cooling

1 Answer

My Robertshaw 9420 thermostat keeps flashing, it won't let me set a temperature.


my robertshaw 9420 wont let me set a temp and two snowflakes are flashing

Dec 23, 2009 | Heating & Cooling

1 Answer

Robertshaw 9420 thermostat engages inside fan in OFF position


check with the company u brought it from and check if you have not put the correct conector to the right temals on the back of the switch.

Jun 09, 2009 | Heating & Cooling

2 Answers

Robertshaw 9600: Temperature rises too high, fan doesn't stop.


It sounds like the thermostat is wired improperly. One quick was to check is by finding breaker to unit and shutting off power. Go to thermostat and remove from wall take all wires off thermostat besides wire going to R(might be RcandRh) and C(which is common) Tape all bare wires removed with electrical tape. Now go back to the breaker and turn power back on. Nothing should be running at all. Take a voltage meter and measure the voltage from R to W(which is heating). If you read 24V then the thermostat is open and not calling for heat. Now turn the thermostat up so it is calling for heat. You should read 0V from R to W. If this checks out your thermostat is probally fine. You can check the fan the same way by going from R to G. In auto you shoul read 24V from R to G and in th on postion you will read 0V from R to G. If the thermostat checks out then the problem is probably at the furnace or rooftop. Either with the thermostat wiring or the main board acting up

Jan 19, 2009 | Heating & Cooling

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