Treadmill “E1” Error After 5–10 Seconds

Answer: No speed feedback means the tach input circuit on the board is open. We reflow/replace the input op-amp, clear E1, and return the board plug-and-play.

Quick take: E1 (or similar) means “no speed feedback.” Either the speed sensor is dead or the MCB can’t read it.

Rapid checks

• Ensure the magnet/optical flag passes directly over the sensor eye.

• Measure sensor output: ~5 V pulses on a multimeter set to DC average.

Board‑side faults we see

• Op‑amp input blown by static discharge

• Cracked resistor in pull‑up network

• Oxidized connector pads

UpFix approach

We install brand‑new op‑amps, re‑establish gold‑flash contacts, and verify the board holds speed within ±1 % across 1–12 mph.

Start your repair online. Questions? Call/Text 888‑979‑9343.