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I installed a honeywell wifi thermostat to replace my older

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unit. My older thermostat...
I installed a honeywell wifi thermostat to replace my older unit. My older thermostat only has 4 wires. So I moved the G wire to C. On the furnace side I moved the G wire to C and put a jumper between G and Y. Problem is I can't get the fan to go on at all...even when the AC kicks on outside.
Submitted: 2 years ago.Category: HVAC
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Answered in 19 minutes by:
6/13/2015
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Comfort Specialist
Comfort Specialist, HVAC Technician
Category: HVAC
Satisfied Customers: 1,368
Experience: Master Lic. holder for HVAC & Gas, Contractor, Estimator, Designer, Air Balance Certified, LG Master Commissioner, UNC Cert. holder for Industrial Ventilation
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Hello there, can you tell me the model# ***** your thermostat?
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HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
And did you jump the Y and G at the furnace or thermostat or both?
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Customer reply replied 2 years ago
RTH9580WF is the model number. I did the Y and G jumper only at the furnace side.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Have you tried it without the jumper?
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Customer reply replied 2 years ago
No. I was told I needed the jumper to energize G to run the fan. Since I pulled the wire out of G and put it to C; on the furnace side.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
With an air handler that is true. If you have a gas furnace most will start the fan without energizing the G terminal as long as Y lands on the furnace Y terminal. Can you check that and give it a shot for me.
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Customer reply replied 2 years ago
I'll go try. I'll be right back.
Customer reply replied 2 years ago
I removed the jumper for Y and G on the furnace side. The AC just kicked in, but no fan/no blower.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Ok. Now let's move the Y wire at the furnace over to G terminal on the furnace to ensure if we energize the terminal it will run.
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Customer reply replied 2 years ago
Ok. I'll try that. Be back.
Customer reply replied 2 years ago
There were two wires on Y, furnace side. One was the same color as on the thermostat side (blue), so I moved that one to the G and left the other wire on the Y still. When the unit kicked back on, the fan did not kick in. FYI, just before I changed the thermostats, the fan was working with the AC on the unit.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Very odd. ok take the wires off of Y and G at the furnace. I need you to install a jumper from R over to G at the furnace and press in the door switch. Tell me if the furnace blower starts.
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Customer reply replied 2 years ago
I took out the wires from Y and G at the furnace. I put a jumper from R to G at the furnace and pressed in the door switch. No blower.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
In this case something else is going on.Are you positive the blower was running before with the old thermostat?
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Customer reply replied 2 years ago
Yes. I had the fan set to "on" so I could keep the air moving in the house.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
And when you set the thermostat to heat does the blower start after the furnace fires now?
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Customer reply replied 2 years ago
Didn't try that. Do I need to put the wires back on Y and pull the jumper from R and G? Do I add the jumper from Y and G?
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Take the jumper off but leave the other two Y wires out and away from the terminals so not to bump anything.
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Customer reply replied 2 years ago
Furnace came on fine. The blower did not.
HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Yeah we have something bigger going on here. See in heating mode that furnace is going to tell the blower to turn on not the thermostat so it shouldn't be anything to do with the new thermostat or wiring. How about trying the old thermostat one time to be sure?
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HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
We'll keep chatting don't worry about paying for more time.
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HVAC Technician: Comfort Specialist, HVAC Technician replied 2 years ago
Any progress?
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