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Question DetailsAsked on 12/20/2017

Blower not working in cooling

ust installed a new thermostat from home depot. A Honeywell Programmable thermostat 2300B series. When I got finished installing it I tested each function. The heat came on and the blower came on 2 minutes after the furnace warmed up. then I tested the fan switch and the blower came on in the "on" position. But when I turned on the cooling with the fan switch set in "auto" the blower would not come on and the outside unit did come on just not the blower. So I turned on the fan switch to "on" and the blower came on so I switched it back to auto and checked the voltage to the fan relay and read 13 Volts in the "auto" position and the blower would not come on but in the "on" position it read 24 volts to the fan relay. Is the problem in the thermostat or the fan relay?

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2 Answers


Could not get the manual for that model to come up on their website - may be a browser issue. But that is very similar to the model I have - which has jumpers on the back that have to be moved around depending on whether you have furnace, A/C boiler, etc - so I am guessing that uyou need to read the manual and configure the jumper wire correctly.

A relay does not act as a transformer and I have never seen a thermostat which did - so on the 13V versus 24V thing, I am guessing your thermostat runs as 12-13V on its batteries versus the 24V coming from the HVAC system and you picked up the thermostat voltage side of the relay - the other side is most likely the HVAC "line" side and has 24V across it when active.

On the 2 minutes before the fan came on - that is WAYYY too long for a furnace blower to come on (assuming the furnace was actually firing - i.e. that the thermostat was calling for heat. Could be the blower came on because it is one of those with a timed blower cycling - runs for several minutes every 15 - 30 minutes just for ventilation circulation even if the furance or A/C is not running. Anotehr possibility - read up onthe anticipator setting in the thermostat - there may be a jumper or a DIP switch which needs to be set to match the type of HVAC equipment you have. For instance, it may have come set for a hydronic (hot water) or steam system, so is set to turn on the circulating pump (using the fan wiring) 2 minutes after the boiler cranks up. A furnace should kick up the blower within say about 5-10 seconds of the furnace firing up.

Good Luck - if above does not lead you the right way and double-checking wiring does not find a loose or broken wire connection, then I guess a Heating and A/C contractor (your Search the List category) is who you have to turn to get it solved.

Answered 2 years ago by LCD


Answer here - NOT the blower relay because it is working OK in the FAN position and was presumably working OK before, so broken wire, bad connection, or thermostat settings is the issue.

Another thought on the jumpers on the back - in addition to it maybe thinking it is on a boiler system (as evidenced by the furnace fan kick-on delay), the A/C coming on but not the blower probably means its jumper is set to for a mini-split type A/C unit, not a central air system - so it is not sending a signal to the blower to turn on when the A/C is running because ti thinks you are on a ductless A/C system.

Honeywell has pretty decent tech support too - and they even speak English.

Answered 2 years ago by LCD

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