Mitsubishi Electric MSZ / MSY / MUZ / MUY GL NA series error code 8 blinks, 2.5 s OFF
Outdoor fan motor
Quick answer
On Mitsubishi Electric MSZ / MSY / MUZ / MUY GL NA series, 8 blinks, 2.5 s OFF is a fault. It means outdoor fan motor. A first thing to check: A failed outdoor fan motor.
- Applies to
- Mitsubishi Electric MSZ / MSY / MUZ / MUY GL NA series
- Mitsubishi Electric MR SLIM GL series split codes · Mini Split
- Type of code
- Fault
- Urgency: Needs attention soon
- First safe check
- Look at the fan through the grille and note whether it is stationary or turning slowly, because speed separates a capacitor fault from a bearing fault.
What 8 blinks, 2.5 s OFF means on this model
The condition is specific: the outdoor fan has stopped three times in a row within thirty seconds after outdoor fan startup, which is the drive detecting a stalled fan. The manual directs checking the outdoor fan motor and then the inverter P.C. board, in that order.
Symptoms you will notice
- Upper lamp blinks eight times after a three second hold, no beep
- The outdoor fan does not run
- The outdoor fan is noisy or hunting for speed
- The system works in mild weather and fails in hot weather
Common causes
The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:
- A failed outdoor fan motor
- A seized outdoor fan bearing
- A failed condenser fan capacitor
- A loose or corroded fan motor connector
- A failed output on the inverter P.C. board driving the fan
- Debris jammed in the fan blade path
What you can safely check
These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.
- Look at the fan through the grille and note whether it is stationary or turning slowly, because speed separates a capacitor fault from a bearing fault.
- Check the fan motor connector for a loose or corroded pin.
- Check for debris against the fan or blocking the discharge grille.
Do not do these
- ×Do not reach through the grille to spin the fan with the power switch on.
- ×Do not fit a capacitor without checking it, because a bearing that is dragging also runs slow and a new capacitor will not fix it.
- ×Do not run the outdoor unit with the fan disconnected to see if cooling improves. That is how the compressor gets destroyed.
When to call a technician
Book a technician, do not keep resetting it
This fault will not clear on its own. Every power cycle gives the control one more failed attempt, and repeated attempts are what turn a cheap part replacement into a seized or contaminated system.
- The refrigerant circuit is sealed and legally requires licensed handling. Opening it without certification releases refrigerant and can put the whole system in violation of regulation, so a low-pressure or high-pressure fault on this equipment is a call-out, not a weekend job.
- If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.
Watching the fan and clearing debris is reasonable for a homeowner. Motor and capacitor work is a technician job.
What it costs to fix
Parts
Outdoor fan motor $300 to $700. Fan capacitor $30 to $80. Inverter P.C. board $500 to $1,200.
Labor
One to three hours to diagnose and replace.
DIY or technician
Watching the fan and clearing debris is reasonable for a homeowner. Motor and capacitor work is a technician job.
Typical US part and labor ranges, 2026. They vary by region, model and contractor, so treat them as a planning figure, not a quote.
Scope of this code
- Code table
- Mitsubishi Electric MR SLIM GL series split codes
- Models in scope
- Mitsubishi Electric MSZ / MSY / MUZ / MUY GL NA series
- Checked
- Confirm on your own unit
- Find the model number on the data plate, then check this code in the service manual for that model. Manufacturers revise code tables between model years, and a revised board can renumber a fault.