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Old system has a 6006 aquastat wiring through line voltage of fan relay on board. New Trane a/h has variable speed motor no line voltage fan relay question: How to wire 6006 aquastat to new low voltage board i do have a 8222d relay for t-t from boiler that is wired to line voltage of fan relay. Thanks in advance Chris

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Hello The easy way to bring the blower on for heating is if the thermostat has an ELECTRIC heat function or selector switch.That will bring on FAN during a call for heat.The aquastat won't be used.

Posted on Sep 08, 2010

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Goodman AC blower is not working. How do I fix this problem?


You need a simple relay. But, if you want it to run and never stop temporarily, take the black wire off the relay on the board ( the wire that goes back to the 240 side of the transformer and run it straight to the speed tap from the motor that's connected to the relay. I'll help you with the relay when you get when but this will make it run provided the board or relay is bad.

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Why does my Ruud HVAC ventilation fan run constantly?


The two relays on the control board are for the heat (low speed) and for the cool (high speed) cycles. You should be able to determine which speed is sticking in by removing one at a time the heat speed wire and the cool speed wire. At any rate the circuit board will need to be replaced to correctly resolve the issue. If you have a 'clamp on ammeter' you could determine which wire to the motor (in addition to common) is remaining in the circuit. My concern is if the cool speed is the relay that is stuck on the motor may overheat when the heat relay closes. The circuit board reverses the position of the contacts in the two relays when in one mode or the other and stuck relay contact will not allow the opposite speed to de-energize. When you said the motor sounded like it was running 'correctly' when the cool speed was removed leads me to believe you have two winding energized due to the stuck relay and motor overheating and eventual failure is bound to occur. There is an internal winding thermostat that shuts power off when the motor overheats, but only so many times then it will remain open necessitating motor replacement.

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Dec 27, 2014 | Ruud Heating & Cooling

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The blower doesn't work for the a/c


Check fuses, then the relay. Fused power to the lower speeds, and a relay sends power to the fan for high speed. Some cars have an electronic blower motor for a variable speed system. The motor could be bad, or the motor board could be bad, if you have a variable speed blower motor. Very expensive to replace. 250 to 400 dollars. good luck.

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Front Blower does not work on 2008 town and country.


At the moment, I think something wrong with "totally integrated power module", some people call this the bcm. There is no relay or fuse for front blower motor, there is a relay for rear blower. The dark blue wire is voltage from bcm or if you wish totally integrated power module. You could check the wire circuit/dark blue wire. With hvac turned on, check for voltage at the blower module and bcm, you could also check continuity, no voltage on the system.
bcm-k3ogftuw3m4btl2sdnhycg1u-1-0.jpg

May 03, 2017 | Cars & Trucks

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THE COOLIN FAN ON MY CAR DONT WORK


Hi.

The car model was not included in the question. In general if the radiator fan is not starting the first thing to check are the fuses. Depending on the car's model there is one or two fuses in line with the cooling fan circuit. If there are two fuses, then one is in the fuse plate inside the car, the other one is under the hood.

The next part to test is the thermostat. The thermostat housing is located on the refrigerant fluid lines, either near to the radiator, or near to the engine block. The thermostat can be tested using VOM tool. Read either Ohms or volts to find out if the thermostat is closing the fan circuit when the engine is hot.

Most fan circuits use also relay. Variable speed fans have often more than one relay. The fan relay(s) is often located under the hood. Relays can be tested reading volts at their contacts or swapping the relay with one of the same kind.

If fuses, relay and thermostat are OK, then the fan motor is often the next test. The motor can be tested energizing it directly. Variable speed fans have more than two wires powering the motor. To avoid risk of damaging the fan motor the repairer should refer to specific wiring diagrams before jumping fan cables. A different way of testing the motor is reading volts at fan motor while engine is hot. If there is volts at motor contacts but motor does not come on, then the fan motor is defective.

Regards.

Ginko

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1 Answer

Our fan is not running on the outside unit. I was told it needs a new control board. It is a varidable speed motor...and is only 4 years old. Could this be true


Hi,
Yes that could be very ture, but impossible for mke to tell for sure without actually checking the output of the board...those boards are very suseptible to power surges and voltage fluctuations though...
They also are not that reliable at any rate...the variable speed features save electric but come at an increased cost in maintenece often times not holding up as well as the older more reliable on/off relays.

If you really want to know I would call another comapny and get a second opinion...

heatman101

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Temp in my home will not drop below 81 degrees


Air Handlers differ in the way they adjust there variable speeds. Carrier you just plug into a pin. Trane has dip switches with directions on the fan housing. Before you try to adjust please kill power to air handler. Varriable speed are very sensative to voltage. If I new your air handler brand I could help. But just check the wiring diagram and they may ahve dirrections on there for setting speed. Need more help call back Rus

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