Robertshaw 9600: Temperature rises too high, fan doesn't stop.
Temperature rises beyond setting. I usually have to switch to air conditioning/ summer to stop process and cool office. Sometimes (today) fan doesn't stop and temperature is up to 87 degrees. If I get the fan to stop and the temperature cools, I set it at night to 65 degrees with fan on auto. When I get to my office in the morning it may be 80 degrees with the fan non-responsive.
Re: Robertshaw 9600: Temperature rises too high, fan...
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
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If any of the following conditions occur, stop the air conditioner immediately, turn off the main power switch and contact the
• The indicators flash at short intervals (5 Hz). Reset the circuit breaker 2 to 3 minutes after the power main switch is turned
Despite the resetting operation, the indicators still continue turning on and off.
• The main power fuse often blows, or the circuit breaker is often activated.
• Foreign matter or water has fallen inside the air conditioner.
• Any other unusual conditions are observed.
Before asking for servicing or repairs, check the following points.
• The power main switch is turned off.
• The circuit breaker is activated to cut off the power supply.
• The main power fuse has blown.
• The electric current has stopped.
• The batteries in the remote controller used up.
• The ON timer is set.
• As a protective mechanism for the air conditioner, it does not operate for 3 minutes
immediately after restarting operation or turning on the main power.
Poor cooling or heating performance
• The air inlet or outlet of the outdoor unit is blocked.
• Doors or windows are opened.
• The air filter is clogged with dust.
• The louver is not at the correct position.
• The fan speed is set to low.
• The air conditioner is set
to the DRY or SLEEP MODE.
• The temperature setting is too high (during cooling operation).
• The temperature setting is too low (during heating operation). (heat pump models)
Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.
If your living space is a single floor plan:
Turn the air conditioning on
Switch the furnace fan from auto to on.
Measure the temperature in each room.
Close the vents by about half in the cooler rooms
This will force more cool air into the warmer rooms.
Keep adjusting the vents until all the rooms have the same temp.
If your living space is on more than one level:
Turn on the air conditioning.
Switch the furnace fan from auto to on.
On the lowest level of the house close half of the vents that are the closest to the stairs.
This will force more cool air to the top floor where it is usually hotter.
Cool air will sink from the upper floors which will keep the area near the stairs cool.
Measure the temperature in all the rooms.
Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.
Try the reset button. You will have to pull the front off the thermostat, the reset button is inside about middle left. This should take care of the problem. If not you will have to replace the thermostat. Hope this helps.
Let see if I can help. The numbers don't come up so we'll just try your information.
Exhaust - should be closed when using for Air Conditioning Energy savings turns the fan off with the compressor when set for Air Conditioning Fan Only means just that (no Air Conditioning) Fan speeds Quite same as low, Norm same as medium, Super same as High Temp settings, what the thermostat senses before cycling compressor.
Due to the many different questions I see about Air Conditioning, I am including this overview to help us better understand each other for trouble shooting. A basic air conditioning system has a Thermostat, Air Handler or Furnace Fan and a Condensing unit. In a split system, the condensing unit (Condenser) is separate from the furnace and usually in the back yard. When working properly, it blows hot air. It connects to the cooling part of the system by 2 copper lines. One large line and 1 small line. The part that cools the house is the "Evaporator" and is usually on top of the furnace inside the square metal box (Plenum). When the Air Conditioner is running, the large copper line should be cold and the smaller line should be warm. Common signs of low refrigerant are that both lines are the same temperature and/or frost or ice has built up on the large line at the condenser. The thermostat will normally display room temperature on till it is touched to change the setting. It could have a "Span" setting as well as times and temperatures. The operating "span" of MOST residential thermostats is 40 to 90 degrees. That means you can set it as low as 40 degrees and no higher than 90 degrees. It probably has a fan switch also. When in the "ON" position, the fan will run constantly, 24 / 7, but the condenser will still cycle on and off as needed to keep the house at set point. If you have a suggestion to include in this paragraph, please let me know.
I think I have it covered above. Let me know if you need something more specific. Thank you. Roger
If you haven't replaced the thermostat this would be a good place to start. Second, if your van has an electric fan (especially if it has an open frame on the motor) It can fail intermittently, causing this condition. (this happened to my PT Cruiser). The fan is supposed to come on anytime that the sensor detects high temperature whether the vehicle is running or not. Hope this helps.
It may be tripping the high temperature limit sensor. Check the flashing light error code to see whether it may be related to the limit switch. If so, have a technician use a thermocouple to measure the air temperature rise from the air intake to the air outlet of the furnace. Compare that the rated temperature rise of the furnace. If it's too high, You may have inadequate air flow. That could be due to an air filter that is too dirty or restrictive, or too many vents closed in the house, or inadequate ducting. It also could be that the blower is set to run at too low a speed. In my house this was the case. We had to rewire the connection to the blower to bump it up to high speed. This brought the temperature rise down to about the middle of the rated range, and now the furnace stops shutting off prematurely.
Have you confirmed that the thermostat is programmed correctly?
Did the thermostat ever control the temperature of the house properly?
When you indicate "kick", are you talking about flipping the Auto-On switch back and forth? The Auto-On switch only controls the fan, and no heating or cooling (Auto - fan runs on call for heat or cool, On- fan runs all the time.).
If "kick" means making the heating work, and if you have the same problem for making the cooling work, chances are good you have bad thermostat.
If the problem only occurs with the heating, and cooling works fine, then the problem could be in the controller board of the furnace, assuming you have a more recent (1990's or newer) furnace.