Can you help please ? I have a Ruud heat pump split system with a very old thermostat that I want to replace with a Vision Pro 5000...My question is, what is the color coding for the 24v side of this unit? There is a red, white, brown green and yellow wire going into the themostat ...which of these wires are common and which wire controls the reversing value...Thank you R L Pepper

how about direct from Ruud?

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Whether you're looking for our high-tech, but incredibly easy to use EcoNet Control Center or just a standard Ruud thermostat, you're in the right place.
There was one here

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Are you talking about a pro 5000 Thermostat??? if so then NO it will not work.With this stat you do not have a temperature lock on the heat pump. Say you don't want the heat pump to run below 25 degrees. it won't shut the heat pump. And you don't want the heat pump to run at the same time as the furnace. With the Pro 8000 3 heat and 2 cool thermostat you can lock out the heat pump at 25 degrees outside an turn the furnace on. You will have to install an outdoor thermostat hooked up to the pro 8000 it usually comes with the stat. Honeywell products.

try changing contacter and capacitors. the c-083-s drier can be replaced if you pump system down. kind of expensive.

This may be as simple switching the thermostat to electric, under the cover is a gas/electric dip switch. Hope that helps.

Is this a heat pump system? If so I would recommend switching the thermostat to aux. or emegency heat at night when it is cold outside. The heat pump will not keep up when the outside temperatures are real cold.

Is this a heat pump? If it is the switch you thermostat to Aux. or emergency heatt.

Whats' so hard is the Honeywell thermostat has a built in 1@ differential. It is not adjustable.
You might ask your installer about a time delay relay installed in the furnace to break the thermostat heat wire (usually white wire).
Most time delay relays are 90 seconds. But that might be enough to reduce the furnace cycling.

The Vision Pro is a great t-stat and I have installed many of them with great results. I am wondering though if it is set up correctly. Did you go in and make sure that it is set for heat pump and for 2 stage heating? Look on the instructions how to get into the advance installer options. Go through that meanu and make sure that everything ig set correctly for your type of heating system and that it is set for 2 stage heating. From what you have here and I can tell the wiring should be okay that is why I think that it is in the t-stat programming.

your rev valve wire needs to be hooked to O/B them you need to get into the install menuby pressing the button on the far left bottom and up arrow at the same time. then you will need to set # 1 (systeem type) to #5 if you dont have a # 5 to right of # 1 then you have the wrong stat and it wont work w/ a heat pump. if you do then hit next till you get to #2 and set for 0 if its a RUUD or a RHEEM then set to 1. nothing else really matters to much

all heat pumps follow the same schematics universal get a hold of any heat pump schem and you should be able to aplie it to yours