WDT circuit fault

Stop riding Last verified: pending review Reviewed by: editorial team

Quick answer

Error code 37 signifies a fault in the Watchdog Timer (WDT) circuit. This circuit is crucial for monitoring the system's operation and ensuring that the controller functions correctly. If this error occurs, it may prevent the eBike from operating normally.

Stop riding Often DIY-friendly Beginner (15–30 min)

Does this apply to your bike?

H700 · Bafang · Common displays: DP E171

Heads-up: the same number can mean different things on other systems — always check your drive system first. Browse all drive systems →

What you’ll notice

The display shows error code 37, and the motor may not function.

Likely causes, ranked

Start at #1 — causes are ordered by how often they turn out to be the problem.

#1 Faulty WDT circuit

How to check: Inspect the controller for any visible damage or loose connections.

Troubleshooting steps

Inspect the controller

Tools: None easy

Check the controller for any signs of damage or loose connections.

If it passes →Proceed to reset the system.

If it fails →Contact a professional for repair.
Reset the system

Tools: None easy

Turn off the eBike, wait a moment, and then turn it back on.

If it passes →Check if the error code clears.

If it fails →Contact a professional for repair.

When to stop and get professional help

If the error persists after inspection and reset, stop riding and seek professional help.

Never open, puncture, or disassemble the battery pack, and never bypass the BMS. See our safety guide.

More codes for H700

33 · Brake detection circuit is fault 35 · Detection circuit for 15V has an error 36 · Detection circuit on the keypad has an error 41 · Total voltage from the battery is too high/low 42 · Total voltage from the battery is too high/low 43 · Total power from the battery cells is too high

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Sources & verification

Last verified: pending review Reviewed by: editorial team

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