HVAC Service Call: Daikin VRVIII Heat Pump Not Cooling/Heating (Error Code J4) Daikin Inverter A1P

HVAC Service Call: Daikin VRVIII Heat Pump Not Cooling/Heating (Error Code J4) Daikin Inverter AC / Daikin A1P Board / Daikin A3P Board / Daikin Inverter Board / Daikin VRVIII service Call / Daikin VRV Not Working / Daikin VRV Troubleshooting / Daikin VRV Testing / Daikin VRV Training / Daikin Error Code J4 / Daikin Heat Pump Troubleshooting / Daikin Customer Service / Daikin VRVIII Service Manual / Daikin VRVIII Installation Manual / Daikin Thermistor Assembly
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DAIKIN Error Code Search:
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Daikin A Error Codes
AO Indoor Error of external protection device
A1 Indoor PCB defect
A3 Indoor Malfunction of drain Level control system
A5 Indoor Freeze-up prevention
A6 Indoor Fan motor lock - overload
A7 Indoor Malfunction of swing motor flap
A9 Indoor Malfunction of EEV
AF Indoor Drain level above limit - clogged
AJ Indoor Malfunction of capacity set device
Daikin C Error Codes
C3 Indoor Malfunction of drain thermistor
C4 Indoor Malfunction of liquid pipe thermistor
C5 Indoor Malfunction of gas pipe thermistor
C7 Indoor Lower louvre limit switch - motor
C9 Indoor Malfunction of air thermistor
CC Indoor Malfunction of moisture sensor
CA Indoor Malfunction of discharge air thermistor
CJ Indoor Malfunction of remote control thermistor
CE Indoor Malfunction of radiant heat sensor
Daikin E Error Codes
E0 Outdoor Activation of outdoor safety device
E1 Outdoor PCB defect
E3 Outdoor Activation of high pressure switch
E4 Outdoor Activation of low pressure switch
E5 Outdoor Activation of compressor over heat protection
E5 Outdoor Compressor motor lock
E6 Outdoor Compressor start up error
E6 Outdoor Standard compressor lock overcurrent
E7 Outdoor Fan motor lock - Overload
E8 Outdoor Inverter input overcurrent
E9 Outdoor Malfunction of EEV
EA Outdoor Four way valve defective
Daikin F Error Codes
F3 Outdoor Abnormal discharge pipe temperature
F6 Outdoor Refrigerant overcharged
FC Outdoor Low pressure drop
Daikin H Error Codes
H3 Outdoor High pressure switch defect
H4 Outdoor Low pressure switch defect
H6 Outdoor Compressor motor position detection sensor error
H7 Outdoor Fan motor position detection sensor error
H8 Outdoor Current transformer error
H9 Outdoor Malfunction of air thermistor
Daikin J Error Codes
J1 Outdoor Faulty/Fault of pressure sensor
J2 Outdoor Current sensor Faulty/Fault
J3 Outdoor Faulty/Fault of discharge pipe thermistor
J4 Outdoor Low pressure saturation thermistor
J5 Outdoor Faulty/Fault of suction pipe thermistor
J6 Outdoor Faulty/Fault of heat exchanger thermistor
J7 Outdoor Faulty/Fault of heat exchanger liquid thermistor
J8 Outdoor Faulty/Fault of liquid pipe thermistor
J9 Outdoor Faulty/Fault of gas pipe thermistor
JA Outdoor Faulty/Fault of discharge pipe pressure sensor
JC Outdoor Faulty/Fault of suction pipe pressure sensor
JH Outdoor Faulty/Fault of oil temperature sensor
Daikin L Error Codes
L0 Outdoor Malfunction of inverter
L3 Outdoor Electronic component box overheat
L4 Outdoor Inverter cooling defect
L5 Outdoor Comp motor ground fault Short circuit
L6 Outdoor Compressor motor grounding short circuit
L7 Outdoor Total input overcurrent
L8 Outdoor Comp overload - Motor disconnected
L9 Outdoor Compressor lock
LA Outdoor Power unit malfunction
LC Outdoor Transmission between inverter and outdoor
Daikin P Error Codes
P1 Outdoor Inverter over ripple
P3 Outdoor Thermistor abnormality
P4 Outdoor Power unit humidity sensor malfunction
PJ Outdoor Failure of capacity set resistor
Daikin U Error Codes
U0 System Shortage of refrigerant or EEV failure
U1 System Negative phase, Open phase
U2 System Power supply insufficient
U3 System Wiring check operation not executed
U3 System Mismatch of indoor and outdoor units - Split only
U4 System Transmission between indoor units
U5 System Transmission to remote controller
U6 System Malfunction transmission outdoor to BP unit
U7 System Transmission between outdoor units
U8 System Transmission between master and slave RC
U9 System Transmission error between indoor to outdoor
UA System Excessive number of fancoils
UC System Address duplication of central controllers
UE System Transmission error between indoor and central
UF System Refrigeration system not set wiring - piping
UF System Terminals 1 and 3 crossed (Split Skyair)
UH System System error Refrigeration system set up
Daikin M Error Codes
M1 System PCB defect
M8 System Transmission error between central controllers
MA System Improper combination of optional controllers
MC System Address duplication Improper setting
Daikin Number Error Codes
64 VAM Indoor unit air thermistor error
65 VAM Outside air thermistor error
6A VAM Damper system alarm
6A VAM Damper system and thermistor error
6F VAM Malfunction of remote controller
6H VAM Malfunction of door switch or connector
94 VAM Internal transmission error

[@alpha-omega337]

These VRV/F units are standard over here in Europe. Sucks to work on them because they're so difficult to properly diagnose. good job on your hand!

[@stueyknuxx]

Same here in Australia, everywhere ! They aren't too bad if you have the right tools, the service tools aren't cheap but if you're doing VRV's all the time its well worth it !

[@LC-qi5ff]

Well done, these vrv’s are not easy to work on

[@illillillillila]

On those Binary systems, H2P and H3P stays solid, that means you have an error and must get the code from the Navigation Controller (thermostat). The Green light you're seeing are normal light communicating with the inverter board (inverter compressor) and the main PCB Board (A1P). I'd suggest downloading Daikin Tech Service App. Useful app, hopefully you have a Daikin service checker with the computer program, if not goodluck.

[@MrTurkeyslayer7]

I work on these from time to time but mostly lg vrf. I would highly recommend getting the service tool for these. For troubleshooting and viewing purposes they sell a service tool that is connected via wifi to their app and you can control all indoor heads and monitor all live conditions. You would have seen a missing thermistor value or a thermistor value of max resistance value if you had the tool. It saves lots of time and frustration

[@EverythingHVACR]

Nice work, we are seeing more and more of these units out there.

[@sherwinalvarez7365]

Great video. Hate mini spilts but you made it look easy. I must say i cant wait to see you running all those thermistors. It gets tight in there.😒

[@wd8557]

Good job. Their is a guy on here Bon MJ , he is the VRV GURU hands down period best on here. Give him a watch

[@im_al9274]

H3P indicates normal operation. A solid H2P indicates a fault with the system. Nice troubleshooting but fyi I would download the Daikin service app next time as it will be your go too for Daikin equipment and troubleshooting. We use this in the UK hope this helps. 👍🏻

[@thesilentonevictor]

Great troubleshooting jmt

[@joshperez7731]

Very knowledgeable, love watching your videos man, helps me trouble shoot units. I've always hated daikin because they're intimidating af and you always have to call tech support, but you broke it down so easily.

[@izzybell11]

Great job JMT. Interesting and helpful video.

[@johnwalker890]

Good job Jumper.

[@nicolerennie]

wow difficult all around. you did a great job JMT👏🏼👏🏼👏🏼

[@come_on_now]

Nice work on the servicing of that unit! You appear to be a very thorough service tech. I can afford to pay you $60 per hour here in California. LMK

[@jaimekeeham7087]

Excelente video , you really help all of us

[@SupremeRuleroftheWorld]

the green flashing is the heartbeat signal. it means the communication between the boards works and the processing on the board has not crashed.

[@roceloi]

Impressive machines! it looks cool! i will suscribe

[@kennethlobo4420]

Great trouble shooting. God Bless.

[@BridgeWater94]

Love your videos man, as a green hvac tech I’m learning so much. I really wish I could have a experienced tech by my side to learn from. I work for a grow facility in Michigan and am the only HVAC tech on site. Work on RTUs chillers AHUs ect. A lot of commercial stuff. Learning day by day it’s def fun.

[@eldar.sultanbayev]

Great job!

[@TheScytheMoron]

I am actually surprised that americans use "Ohms" ... I would not have been surprised if it was like "inch bagels" or so.

[@johntolley851]

Not sure if you work for daikin but we have an app for the light diagnostic

[@truthmatters6719]

Good job mate! What's that app called?

[@mikemalone6103]

You need to have confidence in your diagnosis the thermistor was bad…. Not the shotgun method. I would check the thermistor itself, I’ve had the wires break all but one thread, or fall out…. Keep looking.

[@weld3z]

How old is this unit approximately ? I mean for VRV/VRF after how long you expect troubles to start if running 24/7

[@Modello40]

We used to change thermistor packs and valve heads every three years when doing hotels. Can’t remember definitely, but I think daikin recommend every 5k running hours

[@weld3z]

@@Modello40 Thanks so we can expect 5 to 7 years before replacing the hole unit.

[@Modello40]

@@weld3z that’s ok. Thankfully not. I’ve been working on vrv systems from 2002/2003 that are still going strong. Boards are getting harder to find on the k and l series daikins, but thankfully things like the fan motor boards on 3’s are replaceable still. The new boards just need a new wring harness. I will say though, the newer R32 stuff is not as good as their older stuff. Especially the sky air model. The main board is from a vrv4 and the heatsink thermistor fails. You can’t change that one out as it’s built into the board. Daikin are aware and have released a document highlighting which batches were affected.

[@Cpt_bike_riders]

You gonna count for 100 years man😅. If h2p is lit up thats your error indicator.

[@kashifiqbalzafar]

Hello sir, Can we change 3ph-380v-60Hz compressor of 64LRA, by 3ph-380v-60Hz compressor of 87 LRA

[@eastlandgin]

Looks pretty ridiculous that a they put all the thermistors on 1 wiring harness. 1 bad thermistor requires changing them all. Also, it's such an extremely difficult area for someone to work in. You have to climb over other units, no access to the sides and a several foot drop at the access panels. Installers are assholes. Should never been approved in that location.

[@abdullah_q8171]

Why vrv always hang down ?

[@mdtec9458]

hi where you from ?