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Fox ESS Meter Lost Fault

Updated June 2026 · Reviewed for technical accuracy · ~2 min read

Meter Lost Fault, often shown as Error 242, means your Fox ESS has lost RS485 communication with the energy meter or CT clamp. The inverter can no longer read your import and export, so it cannot control how much power goes to the grid. The solar side usually keeps running, but the smart features that depend on the meter stop working until the link is restored.

What usually causes it

  • A loose or damaged RS485 cable. The most common cause. The connector screws can crush the cable where it clamps under the inverter, breaking a core.
  • A long cable run. Runs over about 50m can degrade the RS485 signal until the meter drops out.
  • The meter is locked up after a glitch and needs a power-cycle to wake the communication back up.
  • Wrong meter settings. Fox ESS expects 9600 baud and address 1. A meter set to a different baud or address will never answer.

How to handle it safely

  1. Check the A and B wires. The RS485 data pair lands on pins 3 and 4 of the meter connector. Make sure both A and B cores are seated and not pinched.
  2. Reseat the connector. Unplug the RS485 connector at the inverter, check it sits square, and push it firmly back home so the contacts bite.
  3. Power-cycle the meter. Remove power from the meter for a minute, then restore it. This clears a locked-up meter and often brings the link straight back.
  4. Confirm the settings. If you have access to the meter menu, check it is on 9600 baud and address 1, which is what Fox ESS expects.
  5. If the cable looks crushed or damaged, stop there. A damaged RS485 cable needs replacing by your installer, not patching.

Quick decision flowchart

Meter Lost Fault (Error 242) appears
↓ reseat the connector and power-cycle the meter
✅ Link returns → it was a loose connector or a locked meter, the fault clears.
❌ Cable looks crushed or damaged → leave it, the cable needs replacing by an installer.
↓
If the wiring is sound and the meter is on 9600 baud, address 1, and it still drops, call your installer.
When to call a professional. Reseating the RS485 connector and power-cycling the meter are safe owner checks. But if the cable is damaged, the run is too long, or the fault keeps coming back, the meter sits on the same board area as live AC wiring. Replacing or rerouting the cable, and any work inside the consumer unit, must be done by your installer or a licensed electrician.

Related Fox ESS codes

BMS Lost Internal Comms Fault Grid Lost Fault

FAQ

Will my solar still work with a Meter Lost Fault?

Usually yes. The panels keep generating and the inverter keeps running, but it cannot read import and export, so features that rely on the meter, like export limiting or load tracking, stop working until the meter link is back. It is worth fixing promptly so your control settings behave correctly again.

I reseated the cable and it still says Meter Lost, what now?

Power-cycle the meter and confirm it is set to 9600 baud and address 1, which is what Fox ESS expects. If the cable run is over about 50m or the cable looks crushed under the connector, that is likely the cause and your installer should replace or reroute it. Do not keep forcing a damaged cable.

Helpful guides

Error codes explained How to safely restart your inverter Inverter not turning on

Sources

  • Fox ESS inverter user manual and FoxCloud alarm list (Meter Lost / Error 242 = RS485 communication with the meter is lost; check the A/B wiring on pins 3 and 4).
  • Fox ESS meter installation guidance (RS485 at 9600 baud, address 1, run length kept under about 50m).
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers reseating the RS485 connector and power-cycling the meter only. Any cable replacement, AC wiring or internal work must be done by a licensed installer or electrician.