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Cannot get 24 volts to the reversing valve - Ruud Central System Air Conditioner

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Have you checked the thermostat? Try jumping R to the reversing valve wire at the thermostat. Thermostat batteries, maybe. Or the thermostat itself.

Posted on Aug 26, 2010

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My reheem heat pump will not switch to heat mode!it last worked about two years ago.


likely a bad reversing valve. need to be sure the reversing valve is getting 24 volts. if 24 volts present at valve coil, GENTLY tap the valve in hopes that it slides. ultimately need a new one.

Nov 08, 2017 | Heating & Cooling

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On a heat pump the difference between haet and cool is the reversing valve


On a heat pump the difference from heat to cool is the reversing valve.
In cooling or heating the Y1 terminal will always be energized, this is the contactor.
Depending on brand the reversing valve will either be energized in Heat or Cool. At the outdoor unit check to see if the reversing valve is getting 24 volts in cool, if not check to see if it is getting 24 volts in heating. The easiest way to check if the reversing valve is shifting, is to feel the big copper tube, (it is not the suction line on a heat pump) this is a refrigerant vapor line. It will be cold in cooling and hot in heating.
Check your thermostat installation instructions and heat pump installation instructions to determine the proper terminal designations for your heat pump and thermostat. There are some brands out there that use the B terminal as common to the 24 volt circuit, so you have to check the wiring and make sure this is not common.
If it is energized in Cool then the Y1 and O terminal will be energized. You will have 24 volts from common usually the C terminal to Y1 and O.
If it’s energized in Heat then the Y1 and B terminal should be energized. You will have 24 volts from common usually the C terminal to Y1 and B.
If you get heat when you’re calling for cooling or vice versa then switch the wire between the B and O terminals.

on Feb 02, 2010 | Heating & Cooling

1 Answer

Heat pump will not change to cool cycle


Most reversing valves energize in cool. Turn t stat to cool, check for 24 volts on orange/w1/reversing valve. If yes, check for 24 on valve itself. If yes and still no cool valve likely stuck

May 29, 2016 | Heating & Cooling

2 Answers

My Home AC blows hot air


You need to check to see if you have 24 volt signal from thermostat to your reversing valve. To go into cooling mode the reversing valve needs to be energized. Orange is normal color of the reversing valve power supply. On your unit will be a reversing valve which looks like a pipe with 3 pipes attached to one side and 1 pipe attached to the other side. On the side of the the reversing valve will be a coil with a 2 wire connection. This coil needs 24 volts applied to shift unit into cooling mode. In your thermostat wire bundle where it is connected, check for voltage between common and the orange wire. If it does not have 24 volts with the thermostat in cooling mode, you have a break in the line normally a connection on the orange junction inside your air handler or your thermostat orange wire is loose. Keep checking for 24 volts available until you find the source of the loss. If you have 24 volts at the reversing valve, you can check to see if the valve is working by unplugging the 2wire connection on the side of the valve, if it clicks its powered if not and 24 volts available then the coil needs replaced.
Any more than this you will need a professional tech to troubleshoot and fix.
Hope this helps.

Jun 21, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Why does it shut off after it starts ? 2a6b3060a1000a american standard


It sounds like a stuck reversing valve stuck in heating mode based on a hot refrigerant line.
It could be stuck in the heat position because it isn't receiving 24 volts to operate, or it could be stuck internally.
Tapping on the copper tubes on the reversing valve sometimes frees one that is stuck internally. It is copper so don't get carried away or you will destroy the reversing valve.
Did you feel the temperature of both copper lines?
If the reversing valve is stuck in heat, during the winter, your heat pump will ice up, because it isn't reversing to cool as it should when it calls for the defrost cycle to occur.
Google "heat pump reversing valve" to see what one looks like
You'll need to use a voltmeter to verify that the reversing valve is receiving twenty four volts.
Pull the two wires at the reversing valve coil and check for 24 volts.
If you don't have 24 volts there when you put the unit in cooling cycle,you either have defective thermostat wiring, or a defective thermostat.
If you have 24 volts you will need to check the electrical coil that the two wires plug into.
Set the voltmeter to ohms, and make contact with the meter leads onto the terminals of the coil. One lead goes on one terminal and one lead on the other terminal at the same time, to check for continuity. You should get an ohm reading. That means the coil is good.

If the meter indicates "0" ohms the coil is shorted and needs replacement.
If the meter doesn't read any ohms at all that means that the coil is burnt out and needs replacement

When the reversing valve is activated there will be a "whoosh" sound you can clearly hear if you are near the outdoor unit.

You can order the A/C parts you need online unless you have friend that is a HVAC tech and he could get one from the Trane supply house.

It is a big job to replace the reversing valve involving freon removal and brazing. Hopefully you will find the problem in the wiring, Thermostat, or the reversing valve coil.

May 16, 2014 | American Standard Heating & Cooling

2 Answers

Furnace gas valve wiring


Just two wires. One is common, & the other is 24 volts from a call for heat.

Nov 23, 2013 | Heating & Cooling

1 Answer

I have 7 wires, how do I wire it Red Green White Black Yellow Orange Blue


Conventional heating, air conditioning and heat pump thermostat wiring labels, wire color codes and the corresponding function description: Terminal
Designation
Wire
Color
Function
Description
Rh Red 24 Volt Hot for Heating Rc Red 24 Volt Hot for Cooling Y1 Yellow First Stage Cooling Y2 Blue Second Stage Cooling G Green
Grey * Energizes Indoor Fan W1 White Energizes First Stage Heat W2 Black Energizes Second Stage Heat O Orange Heat Pump
Reversing Valve
Energized In Cooling B Brown Heat Pump
Reversing Valve
Energized In Heating C Brown** 24 Volt Neutral
(Common) leg

Hope this helps
Tom Miller
Broadcast Eng

Sep 07, 2011 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

I have a new 13 seer rheem 4 ton heat pump system the heat pump won't turn on in heat or in other words it is only working in cooling mode I wired it according to the schematic


On a heat pump the difference from heat to cool is the reversing valve.
In cooling or heating the Y1 terminal will always be energized, this is the contactor.
Depending on brand the reversing valve will either be energized in Heat or Cool. At the outdoor unit check to see if the reversing valve is getting 24 volts in cool, if not check to see if it is getting 24 volts in heating. The easiest way to check if the reversing valve is shifting, is to feel the big copper tube, (it is not the suction line on a heat pump) this is a refrigerant vapor line. It will be cold in cooling and hot in heating.
Check your thermostat installation instructions and heat pump installation instructions to determine the proper terminal designations for your heat pump and thermostat. There are some brands out there that use the B terminal as common to the 24 volt circuit, so you have to check the wiring and make sure this is not common.
If it is energized in Cool then the Y1 and O terminal will be energized. You will have 24 volts from common usually the C terminal to Y1 and O.
If it’s energized in Heat then the Y1 and B terminal should be energized. You will have 24 volts from common usually the C terminal to Y1 and B.
If you get heat when you’re calling for cooling or vice versa then switch the wire between the B and O terminals.

Feb 02, 2010 | Heating & Cooling

1 Answer

Gold Star mini split heat pump 24,000 btu. Changed indooe as we as outdoor boards and still goes in cooling mode only. Reset button on outdoor board calls in heat but not by inside hand set. Len Cabana...


On a heat pump the difference from heat to cool is the reversing valve.
In cooling or heating the Y1 terminal will always be energized, this is the contactor.
Depending on brand the reversing valve will either be energized in Heat or Cool. At the outdoor unit check to see if the reversing valve is getting 24 volts in cool, if not check to see if it is getting 24 volts in heating. The easiest way to check if the reversing valve is shifting, is to feel the big copper tube, (it is not the suction line on a heat pump) this is a refrigerant vapor line. It will be cold in cooling and hot in heating.
Check your thermostat installation instructions and heat pump installation instructions to determine the proper terminal designations for your heat pump and thermostat. There are some brands out there that use the B terminal as common to the 24 volt circuit, so you have to check the wiring and make sure this is not common.
If it is energized in Cool then the Y1 and O terminal will be energized. You will have 24 volts from common usually the C terminal to Y1 and O.
If it’s energized in Heat then the Y1 and B terminal should be energized. You will have 24 volts from common usually the C terminal to Y1 and B.
If you get heat when you’re calling for cooling or vice versa then switch the wire between the B and O terminals.

Feb 01, 2010 | LG LS-K2430HL Heat Cool Mini Split Air...

1 Answer

I am changing out my intertherm thermostat control. the blue wire is hooked up on B, not on RC, can you tell me why


Because it doesn't belong on RC.

B means "blower" in the antique language of the tradesmen, but nowadays it means "reversing valve". RC means "red cool" or "put 24 volts here to power the cooling system".

The blue wire was not connected to RC because it would not bring 24 volts to the RC terminal.

Jul 22, 2008 | Intertherm Heating & Cooling

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