The blower fan is not coming on in AC Mode, can't try Heat Mode because temp is above 80. My dad took the door off and pressed the door switch in, said he could hear a humm. He also said the blower fan turned easily by hand. He is 73 and lives about 2 hours away, is there some way to get a wiring diagram for the Ruud UGPH-07EAUER off the internet
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When you say door are you referring to the front door or the furnace door? If the unit kicks on AND off by itself I would say it's in the tstat or the tstat wire. If it were internal I would think the blower relay or heat contactor/relay were getting stuck AND THE FAN WOULD NOT TURN OFF until you flipped the breaker. Good luck
The fan is located behind the glove box, above the passengers feet. The 2 most common failures are the blower motor and the blower resistor. This system is a switch to ground setup. Unplug the blower plug and see which wire is hot, it should always be with the key on. With the car running and the fan switch on, hit the blower with the palm of your hand. If it comes on, it is bad. the brushes wear out. Also you can unplug the resistor, and ground the output wire at the blower, or resister. to see if it works.
If you turn the unit to heat and say set the temp to 85 and the furnace fires up but the blower doesnt turn on after a minute or 3, 3 things to check. One is the fan control switch in the plenum. It says the plenum is hot and ok to turn on the blower. If the switch is ok, then check the blower and the capacitor. Set unit to AC and set temp to meat locker. Outside compressor and fan should come on immediately. If not
have a friend turn it on from inside while you listen outside. If you here a click, the contactor is good. If it is, check to see if the 230 Volts circuit breaker (inside in the panel) has not tripped. If thats good check the disconnect next to the outside unit. Then check for 240 AC or so on the far side of the contactor. If thats good, check the split capacitor with the power off. If all the above is good, and the fan doesnt come on, replace the motor in the outside fan. If the fan does come on and the compressor does not, see if there is a protection switch that needs to be reset. And if you dont understand the above, call a reputable dealer (ask your neighbors who they trust)
It sounds like the fan limiter switch is going bad. This switch waits until the air temp is high enough for heating the house before allowing the fan/blower to come on. There is another switch that shuts off the blower when the air drops to a certain temp, or it may be the same switch that does both jobs. Hope this helps.
You have a blower relay in the furnace that's probably bad. In the heat mode the blower is on a temperature relay, in cooling mode the blower has to come on immediately so there is another relay for cooling. The green wire on the thermostat feeds that relay, so if you go to the furnace and shut the power off and find the green wire from the thermostat that feeds that relay and replace it, being careful to mark all the wires before removing them, also the relay terminals have numbers for identification.
If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect: fan switch on Indoor fan runs all time Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...
Exception 1- (in a heat pump the out door unit runs in both heat and cool mode
unless it has emergency heat turned on then it will not come on outside
in the heat mode, and depending on the type of heat pump and furnace or
air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat. Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it. Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.
Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones. If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.
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the fan is controlled by a fan center or a stack switch. as burners light and heat up the spring sensor on the bulkhead above burners heats up and turns and a a point energizes the indoor fan if it gets to hot the burners go out on safty. sounds like a fan control is bad tap on them gently and they sometimes break loose but if not then have a pro replace fan control and test heat exchanger.