Mitsubishi Electric aircon 01 / LED1 lit, LED2 once error code

Use this Mitsubishi Electric 01 / LED1 lit, LED2 once error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted.

What does Mitsubishi Electric 01 / LED1 lit, LED2 once mean?

Mitsubishi Electric 01 / LED1 lit, LED2 once is listed as lEV and drain pump in Multi-Split rows such as FP Series, Starmex R32. The loaded row is source-backed by official diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.

Blocked drain pipe, trap, or concealed drain route.
Float switch or drain-level protection triggered by water in the pan.
Drain pump, drain slope, or pan-level issue after clearing is attempted.

What to do now

Use these steps before running the unit again or approving drain or pump work.

Treat it as a fault signal
Stop using the unit if 01 / LED1 lit, LED2 once returns, water leaks, or the drain pan keeps filling.
Reset 01 / LED1 lit, LED2 once once
Capture the 01 / LED1 lit, LED2 once display, then stop the unit if water is leaking or the drain pan looks full. Power-cycle once only if the area is dry.
Send these to us
01 / LED1 lit, LED2 once error code, a clear display photo, Mitsubishi Electric model stickers, affected rooms, reset result, and where water appears

Source-specific guidance

These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.

Source detail	What it says
Source repair action	Do not keep resetting the system if this pattern returns. Record the model number, lamp or LED pattern, and affected rooms before booking diagnosis.
Singapore / model note	Official Mitsubishi Electric checklist action: Check LEV and drain pump.

What to check before repair

Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.

You can check	Technician should confirm
Before resetting 01 / LED1 lit, LED2 once, take a clear display photo.	Confirm whether 01 / LED1 lit, LED2 once is drain overflow, float switch, pump, or water-level protection.
Capture the Mitsubishi Electric indoor and outdoor model stickers so the correct family row is used.	Clear and flow-test the drain route, then check pan level and float operation.
Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset.	Test pump power, pump discharge, and slope on cassette or concealed units.

What changes the next step

These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.

What you see	What it points to
Only one indoor unit shows 01 / LED1 lit, LED2 once.	The affected room, indoor board path, wiring route, or local component should be checked first.
Several rooms or the outdoor unit show the same 01 / LED1 lit, LED2 once fault.	The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking.
Water appears at the indoor unit or ceiling area.	Drain flow, float switch, pump, and pan level should be checked before running again.
The model family is different from the row you found online.	Use the model or series filter first; same-looking codes can still belong to different diagnostic tables.
The model belongs to Multi-Split rows such as FP Series, Starmex R32.	The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts.

Drain clearing or pump decision

Mitsubishi Electric 01 / LED1 lit, LED2 once normally stays in repair scope: clear the drain, test the float or pump, and check slope before discussing replacement.

A blocked drain is usually a service-level repair if flow returns after clearing.
Pump or float-switch work needs part testing before replacement is approved.
Concealed drainage problems become labour-heavy because access decides the repair path.

Mitsubishi Electric 01 / LED1 lit, LED2 once questions

What does the Mitsubishi Electric 01 / LED1 lit, LED2 once error mean?

Can I fix a Mitsubishi Electric 01 / LED1 lit, LED2 once error myself?

No. 01 / LED1 lit, LED2 once needs a technician's measurement before parts are decided. Before resetting 01 / LED1 lit, LED2 once, take a clear display photo. Capture the Mitsubishi Electric indoor and outdoor model stickers so the correct family row is used.

Is it safe to keep running the aircon with a 01 / LED1 lit, LED2 once error?

Stop using the unit if 01 / LED1 lit, LED2 once returns, water leaks, or the drain pan keeps filling.

What causes a Mitsubishi Electric 01 / LED1 lit, LED2 once error?

Blocked drain pipe, trap, or concealed drain route. Float switch or drain-level protection triggered by water in the pan. Drain pump, drain slope, or pan-level issue after clearing is attempted.

Will a Mitsubishi Electric 01 / LED1 lit, LED2 once error need a repair or a full replacement?

Mitsubishi Electric 01 / LED1 lit, LED2 once normally stays in repair scope: clear the drain, test the float or pump, and check slope before discussing replacement.

What should I send a technician about a Mitsubishi Electric 01 / LED1 lit, LED2 once error?

Before booking, send: 01 / LED1 lit, LED2 once error code, a clear display photo, Mitsubishi Electric model stickers, affected rooms, reset result, and where water appears.

Confirm the fault

Share the error code, model number and symptoms so we can assess the likely cause.

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