24 vac where to get - Heating & Cooling

Your system has a dual stage system for better efficiency. That is what the extra wires are. Either get the proper thermostat or decide to operate in single stage mode. High or low - you choose. Marking Wire Color Code Description Marking Wire Color Code Description R Red Power, 24 Vac transformer Rc Red Power from cooling, 24 Vac transformer Rh Red Power from heat, 24 Vac transformer C Black/Blue Common of 24 Vac transformer W White Primary heat cell relay E Brown Emergency heat relay Y Yellow Primary cool call relay Y2 Yellow Secondary cool call relay G Green Fan relay O Orange Change-over relay to cool relay B Blue Change-over relay to heat relay A Heat and cool active to any relay L Emergency heat active lamp X System malfunction lamp P Defrost control lamp

Wiring Examples and Instructions
How-To-Wire-It.com
Basic or Common Connection Points
Terminal Colour Signal-Type Description C Black 24 Vac Common Common side of 24 Vac Transformer See Diagram below R or V red 24 Vac Transformer Power Power side of 24 Vac Transformer See diagram below RH or 4 red 24 Vac for heat 24 Vac power before heat switch see diagram below Rc Red 24 Vac for cool 24 Vac power before cool switch see diagram below Y Yellow switched power (cooling) Signal to turn on cooling system see diagram below W White Switched power (heating) Signal to turn on heating system see diagram below G Green Switched power for fan Signal to turn on fan (forced air) see diagram below
Heat Pumps/Multi-Stage Units
Terminal Colour Signal-type Description Y2 Can vary Switched power (2nd stage cooling) 2nd stage cooling signal to compressor W2 Can vary Switched power (2nd stage heating) 2nd stage heating/ sometimes used as emergency heat E Can vary Emergency heat enable Dedicated emergency heat 0 Orange Reversing value Reversing dynamics of the heat pump ----

The transformer is located in the furnace. You might want to check to make sure the furnace door is on correctly brcause theres a swich that will open for safety . Also some have a fuse on the solid state board.

ensure proper supply voltage to the heater....either 12 or 240 vac. display screen should get 24 vac.....if screen is supplied 24 vac then replace the display screen board.....if not getting 24 vac problem is occuring before display screen

Replace your flame sensor

24 VAC HUM
The yellow wire connected to the I.D. Blower pressure switch
is powered anytime the pressure switch is closed and provides
24 VAC humidifier control. Remove the yellow wire and connect
the supplied brown jumper wire to the pressure switch
terminal. Reconnect the yellow wire to the "piggyback" terminal
on the brown jumper and then connect the 24 VAC line of the
humidifier to the stripped end of the brown wire. Using a wire
nut or a field-supplied quick connect terminal can make this
connection. The wiring must conform to all local and national
codes. Connect the COM side of the humidifier to the B/C
terminal on the furnace control board (or to the COM side of
the 24 VAC transformer). DO NOT CONNECT 115V HUMIDIFIER
TO THESE TERMINALS.

I would check voltage to the transformer and from the transformer. Either 120 or 240 VAC to the transformer and 24 VAC from the transformer. The co ntrol panel runs on the 24 VAC. The transformer should be located in the junction box on the heater where the external power is connected.

Check the voltage at the contactor where the 24 vac connects to the coil for the contactor so you can see if it is making it that far. It will be 2 smaller wires that are not connected to the 240 vac. Let me know if you have 24 vac there. The thermostat will have to be calling for air for the 24 vac to be present. let me know what you find.

You cannot without a 5th wire.

Can the clock be repair or replace, my will not keep time.