STIHL RMI 632 M1170 — No Signal: Fix & Checks
STIHL RMI 632 showing M1170 (No Signal)? Check boundary signal causes in the right order, then continue into MowerFixAI diagnosis.
What to do first
Check that the docking station is powered and transmitting its wire signal. Inspect the station LED and boundary-wire system before restarting.
Check in this order
- Check that the docking station is powered and transmitting its wire signal. Inspect the station LED and boundary-wire system before restarting.
- Record the exact code/message and where the mower stopped before clearing it.
- Avoid ordering a battery, motor or board until simple installation, obstruction, power and connection checks have been ruled out.
- If the same error returns on clear level ground after the supported checks, use an authorised service route.
Safety: Switch the mower off before cleaning wheels or the cutting system. Disconnect station power before handling exposed charging-station wiring. Never open or bypass a sealed lithium battery or safety system.
Why MowerFixAI does not jump straight to a replacement part
An error message identifies the system that detected a problem; it does not always identify the failed component. MowerFixAI uses the mower model, exact error, location and follow-up checks to separate installation, environment, charging, navigation and hardware causes before suggesting a part or dealer.
Symptoms that help narrow this fault
Typical clues include a mower that stops soon after leaving the station, reports a missing or weak boundary signal, behaves differently in one part of the lawn, or cannot reliably find its way home. A green or otherwise normal station light does not always rule out a local wire, connector or installation problem.
Practical checks before replacing parts
- Check the charging-station status light and station power before disturbing the lawn.
- Inspect the boundary and guide-wire connectors at the station for looseness, corrosion or a partially seated plug.
- Think about recent garden work: edging, aeration, scarifying, fence work and animal damage are common ways a loop can be damaged.
- If the fault is location-specific, test known joins and the nearest section of boundary wire before replacing mower electronics.
- If your model supports a temporary/test loop, use it to separate an installation fault from a mower or station fault.
What not to replace too quickly
Do not replace the main board, loop sensor or hundreds of metres of boundary wire simply because the mower says there is no signal. First prove whether the signal is absent at the station, lost in the installation, or not being detected by the mower.
Run the model-specific diagnosis
Continue with the mower and error already identified so you do not have to start from a generic help page.
Diagnose this errorFind a nearby dealerCheck parts diagramsWhen to stop DIY checks
Stop and use an authorised repair route if the mower has impact damage, water ingress, a swollen or damaged lithium battery, exposed wiring, repeated internal electronic faults, or if a test requires opening a sealed battery, power supply or safety system. Bring the exact error text and the checks you have already completed; that can shorten dealer diagnosis time.
Related next steps
Browse popular robotic mower fixes · See more model-specific error guides · Run MowerFixAI diagnosis
Frequently asked questions
What does M1170 mean on STIHL RMI 632?
It points to the boundary signal area. The code identifies the system that stopped operation, but the underlying cause still needs to be narrowed down.
Should I replace a part immediately?
No. Start with safe external checks and confirm the exact model and conditions. A code can be triggered by terrain, installation, obstruction or connection problems as well as a failed component.
What information should I save before resetting the mower?
Save the full error text, model, firmware/app version if available, mower position, station status and what the mower was doing immediately before the fault.
Verification source
This page uses original MowerFixAI troubleshooting text and is cross-checked against the manufacturer support source below. Always follow the safety and model-specific instructions supplied with your mower.