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Battery backup for fujitsu inverter

I have a new Fujitsu Halcyon inverter with one unit outside and two duct type units inside the house. When the power goes out my thermostats revert to factory settings and allow the air handlers to detect temperature. This is a problem since one is located in the attic, and the other in the basement. If on cool, the upstairs unit will run forever trying to cool the upstairs when the attic could be 100 plus degrees. The reverse in winter. The attic will be 40 or less and upstairs will try to heat to set temperature and run forever trying to achieve desired setting. Fujitsu has been no help. Is there a battery backup or thermostat that will work with this setup allowing the thermostat to select room temperature. I fear when not home and power goes out units will burn up trying to heat or cool. Otherwise I am pleased with operation, but feel this is a flaw. I have been told that only the fujitsu wired thermostat will work with this.

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Posted on Jan 02, 2017

ACTECH
  • 80 Answers

SOURCE: Replaced thermostat on FA4ANF030 with Honeywell model rth3100c does not work

if you have a newer t-stat your heat pump reversing valve is either o or b depending on the type of system you have

Posted on Dec 19, 2007

  • 306 Answers

SOURCE: Furnace doesn't reach desired temperature

One of two things you can try. Do you own a volt ohm meter? Anytime your unit cycles short like it is doing the control circuit which on this one is 24 volts that engages relays and controls the gas valve to open and close. I am thinking the heat exchanger is getting so hot it is tripping the upper limit which for the most part is around 180 degrees. So next time it turns off take your ohm meter and with the power to the whole unit off. Either turn the breaker off or there is a light switch that is real close to unit turn it off. Undo the two wires to the gas valve and ohm them out. You should have continuity if you get nothing check each limit switch should have a couple. Undo wires to them and check. If you find one that is open more then likely the upper one. They are a safety device that keeps the unit from getting too hot.

There might be another option increase the speed of your fan motor to get the heat out of furnace quicker. Look at the circuit board notice the fan wiring going to it. The Red wire from fan is low speed look to see if it is on HEAT on the board. You should have 4 speeds to pick from you could take the black off of COOL and swap wires and test the unit by doing that. I'm going to put a solution on this so I can come back to it quicker. Even though we a just testing it for now. ken

Posted on Dec 21, 2008

  • 20 Answers

SOURCE: No heat new thermostat

you have a short in the wireing.disconnect at air handler and hook-up short t-stat wire to t-stat,ifok chk wire to condenser

Posted on Jan 10, 2009

kingbrizzle
  • 407 Answers

SOURCE: problem with mitsubishi air roof units

The thermostat would need to be insulated better from the air that is surrounding it. Im assuming that the thermostat is located on the wall unit where it blows out the air. This could mean that it is actually reading more from the outside temp, than whats inside the house. Another thing to consider is the location of the thermostat, even it being close to anything in the house that produces some kind of heat will effect the condition of the air. If anything, its the manufacturers mistake if it was properly installed in the first place and if defective, they should replace it. hope this helps.

Posted on Dec 28, 2009

  • 1 Answer

SOURCE: The thermostat is a White-Rodgers 1F82-261.

The display on my thermostat is locked on 72 degrees. When I turn the switch from a/c to the off position, it appears that the heat comes on.

Posted on Jul 27, 2010

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