Daikin

Daikin Industries

5 field manuals · 30 error codes · 2 guides

Ask about a Daikin
Air ConditionerFurnace Model & serial

Daikin air conditioners

Field manual · Air Conditioner

Ductless mini-split heat pump / AC: field service manual

Single- and multi-zone inverter ductless systems with wall-mount, ceiling cassette or slim-ducted indoor units. Code meanings are in the air-conditioner error code list; this manual covers concepts and safe electrical checks.

8 components6 common failuresMitsubishi Electric, Daikin, Fujitsu, LG, Pioneer, MrCool, Midea

Field manual · Air Conditioner

Daikin 19 Series wall-mount mini-split (FTX/RX): quick sheet

Daikin 19 Series single-zone wall units sold in the US as FTX…NMVJU / RX…NMVJU (older, rated about 18-19 SEER) and FTX…BXVJU / RX…BXVJU (about 20 SEER2) in 9K-24K sizes. Newer Daikin Oterra (FTXF, R-32) is a different platform. Exact years not confirmed.

5 components2 common failuresDaikin

Error codes

A1 Indoor PCB faultA3 Drain water level too highA5 Freeze-up / high-pressure controlA6 Indoor fan motor faultC4 Indoor coil thermistor faultC9 Room / intake air thermistor faultE5 Compressor overheat (overload pr…E6 Compressor lock / start failureE7 Outdoor fan motor faultEA Four-way (reversing) valve faultF3 Discharge pipe temperature too h…H6 Compressor position-detection er…H9 Outdoor air thermistor faultJ3 Discharge pipe thermistor faultJ6 Outdoor heat exchanger thermisto…L4 Inverter heat sink overheatingL5 Inverter output overcurrentU0 Low refrigerant suspectedU2 Supply voltage out of rangeU4 Indoor-outdoor communication error

Guide · Air Conditioner

Mini-split indoor unit blinking light (reading the code)

A blinking pattern is a fault code. Count the blinks before you reset power, because a breaker reset erases the code. Then look it up for the brand and fix the cause.

4 steps ~30 minmoderate

Guide · Air Conditioner

Mini-split communication error: interconnect wiring check

Most communication faults are wiring: swapped terminals, loose screws, splices or damaged cable, often after a new install or a storm. Check power, then terminations at both ends, then the data signal, before replacing a board.

5 steps ~60 minadvanced

Daikin furnaces

Field manual · Furnace

80% gas forced-air furnace: field service manual

Non-condensing (about 80% AFUE) induced-draft gas furnaces with hot surface ignition and an integrated control board; metal flue vent

6 components3 common failuresCarrier, Bryant, Payne, Goodman, Amana, Daikin, Trane, American Standard, Lennox, Rheem, Ruud, York, Coleman, Heil, Tempstar, Comfortmaker

Field manual · Furnace

90%+ condensing gas furnace: field service manual

High-efficiency condensing furnaces (about 90-98% AFUE) with a secondary heat exchanger, PVC venting and a condensate trap; single-stage, two-stage and modulating

3 components2 common failuresCarrier, Bryant, Goodman, Amana, Daikin, Trane, American Standard, Lennox, Rheem, Ruud, York, Heil, Tempstar

Field manual · Furnace

Goodman GM9S / GMVC96 condensing gas furnaces: quick sheet

Goodman 96% condensing furnaces: GM9S96 / GM9S80 (single-stage, LED flash codes) and GMVC96 (two-stage, variable-speed). Amana and Daikin badge similar platforms. Some newer boards use a 7-segment display instead of a single LED.

7 components4 common failuresGoodman, Amana, Daikin

Error codes

1 flash Ignition failure / lockout2 flashes Pressure switch stuck closed3 flashes Pressure switch stuck open4 flashes High limit open5 flashes Flame sensed with no call for heat6 flashes Rollout switch open (varies by b…7 flashes Low flame signal8 flashes Board-specific (igniter / lockou…Rapid continuous flashing Reversed line polaritySteady on Internal control failure

Identify a Daikin

Reading the model number

Not sourced.

Manufacture date from the serial number

Single source

Many styles; some plates print MFG date directly. Common newer style: digits 1-2 = year, digits 3-4 = month.

Single source with ten styles; confirm with the data plate.

Official Daikin manuals & support

Brand names identify appliances only. OnCall Tech is not affiliated with or endorsed by Daikin.