Description
Product Summary
The Honeywell Residential AT40A1121 is a transformer from Honeywell Residential, described by the manufacturer as: 40VA transformer 120V-24V foot mount. It is rated for 120V. It replaces AT40C1004 & AT40A1014.
A control transformer steps line voltage down to the low voltage, usually 24 volts, that runs the thermostat, controls and valves. Replace a transformer with no output voltage while it has correct input voltage, or one that is burnt or overheating. Find any short that blew the original first.
Before you order, match AT40A1121 to the part number on the part you are replacing or in your equipment's repair parts list, and confirm the voltage, size and connections match your equipment. If you are not sure which part your equipment needs, call us at 1.888.509.3391 with the model and serial number and we will confirm it for you.
Key Features
- Genuine Honeywell Residential part: Manufacturer part number AT40A1121, factory new.
- Voltage: 120V.
- Cross-reference: Replaces AT40C1004 & AT40A1014.
- Part type: Transformer.
Frequently Asked Questions
Is this a genuine Honeywell Residential part?
Yes. This is the Honeywell Residential AT40A1121, a factory-new transformer from Honeywell Residential.
How do I make sure it fits my equipment?
Compare AT40A1121 with the part number printed on the part you are replacing or listed in your equipment's repair parts list, and confirm the voltage and connections match. If you are not sure, call us at 1.888.509.3391 with your model and serial number and we will confirm it.
What part numbers does the AT40A1121 replace?
The Honeywell Residential AT40A1121 replaces AT40C1004 & AT40A1014.
What size transformer do I need?
Match the primary and secondary voltages and choose a VA rating equal to or higher than the original.
Should a professional install this part?
Yes. Gas, electrical, hydronic and combustion components should be installed by a qualified technician who can test the system afterward and follow the codes that apply where you live.
