How to Set Up Eufy Video Doorbell E340 With an Existing Mechanical Chime

Overview

The Eufy E340 supports wiring into an existing mechanical chime but needs the included power kit wired correctly. This guide installs the doorbell and chime controller, enables chime ring-through, and verifies dual-camera operation after setup.

Why This Happens in Real Homes

The eufy E340 is a dual-camera video doorbell that can wire into your existing mechanical chime for an audible ring, and the key to that working is telling the app which chime type you have and providing adequate transformer voltage — a mismatch or low voltage leaves the chime silent or buzzing. It also connects to 2.4GHz WiFi for the app side.

Cut power at the breaker, wire the two doorbell wires to the terminals, and restore power, then in the eufy Security app set the chime type to mechanical (or digital) to match your existing chime. Confirm your transformer meets the voltage requirement and the chime is compatible. Connect the doorbell to 2.4GHz WiFi and install any firmware; the mechanical chime then rings alongside app and HomeBase alerts.

What's Included

• Setting up the E340 with an existing chime
• Chime wiring questions
• Chime not ringing after wiring
• Mechanical vs digital chime
• Transformer voltage questions
• Doorbell won't power
• Chime buzzes/won't ring
• Offline after wiring

Got your materials ready? Here's what to check first.

Before You Start

• Existing transformer voltage too low
• Wrong chime type set (mechanical vs digital)
• Chime jumper/power kit not configured
• Wiring not secured to the terminals
• Breaker/power off during wiring
• Incompatible chime
• Connecting to 5GHz for WiFi
• Firmware update pending

Tools & Requirements

Installation Steps

1

Verify Transformer Rating

Power down the doorbell circuit at the breaker. Use a multimeter to confirm the transformer outputs at least 16VAC under load. Underpowered transformers cause random reboots of the E340. Upgrade to a compatible 24VAC 30VA transformer if measurements fall short.

Needed for this step

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2

Install Chime Controller

Open the existing chime cover and wire the included Eufy power controller across the front and trans terminals per the diagram. The controller conditions doorbell power so the chime still rings when the doorbell is pressed. Double check terminals before reconnecting power.

Needed for this step

1188-Piece Ferrule Crimping & Stripping Tool Ki...

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3

Mount Doorbell

Attach the mounting bracket to the door frame using the supplied anchors and screws. Connect the two doorbell wires to the terminals on the back of the E340. Clip the doorbell onto the bracket and confirm it sits flush without wiggle.

4

Restore Power and Pair

Turn the breaker back on. Open the Eufy Security app, tap Add Device, and follow the prompts to pair the E340 on your 2.4GHz WiFi. If pairing fails, move closer to the router or add an extender near the entry. Confirm the app reports online status.

5

Configure Chime and Cameras

In the app, set the chime type to mechanical so the controller routes power correctly. Adjust both camera fields of view and motion zones. Run a test press to confirm the mechanical chime rings and the app receives a notification at the same time.

Installation Tips

Still stuck? This is usually the deeper cause below.

Need More Help? eufy Security Support

Note: The contact information below connects you directly to eufy Security's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.

How Does eufy Security Compare?

Before replacing your eufy Security device, see how it stacks up against alternatives in our full comparison guides.