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Note

Refer to outdoor unit service manual for request code 0 to 102, 106 to 149.

Request codes 103 to 105 indicate error histories of both indoor and outdoor units.

As only 4 digits can be displayed at one time the software version number is displayed in two halves.

Entercode190toseetherst4digitsandcode191toseethelast4digits.

For example software version No. 5.01 A000, when code 190 is entered 0501 is displayed, when code 191 is entered A000 is displayed.

Request code 200 resets all Function Setting to the factory default settings.

Request

code

Request content Range Unit

103 Error history 1 (latest) Displayserrorhistory.("––"isdisplaysifnohistoryispresent.) Code

104 Error history 2 (second to last) Displayserrorhistory.("––"isdisplaysifnohistoryispresent.) —

105 Error history 3 (third to last) Displayserrorhistory.("––"isdisplaysifnohistoryispresent.) —

154 Watercirculationpump1-Accumulatedoperatingtime(afterreset) 0–9999 10 hours

156 Watercirculationpump2-Accumulatedoperatingtime(afterreset) 0–9999 10 hours

157 Watercirculationpump3-Accumulatedoperatingtime(afterreset) 0–9999 10 hours

158 Watercirculationpump4-Accumulatedoperatingtime(afterreset) 0–9999 10 hours

162 Indoorunit-DIPSW1settinginformation Refer to detail contents described hereinafter. —

163 Indoorunit-DIPSW2settinginformation Refer to detail contents described hereinafter. —

164 Indoorunit-DIPSW3settinginformation Refer to detail contents described hereinafter. —

165 Indoorunit-DIPSW4settinginformation Refer to detail contents described hereinafter. —

166 Indoorunit-DIPSW5settinginformation Refer to detail contents described hereinafter. —

175 Indoorunit-Outputsignalinformation Refer to detail contents described hereinafter. —

176 Indoorunit-Inputsignalinformation Refer to detail contents described hereinafter. —

177 Mixingvalveopeningstep 0–10 Step

190 Indoorunit-Softwareversion1st4digits RefertoNotebelow. —

191 Indoorunit-Softwareversionlast4digits RefertoNotebelow. —

200 InitialisationofFunctionSetting — —

340 Watercirculationpump1-Accumulatedoperatingtimereset — —

342 Watercirculationpump2-Accumulatedoperatingtimereset — —

343 Watercirculationpump3-Accumulatedoperatingtimereset — —

344 Watercirculationpump4-Accumulatedoperatingtimereset — —

504 Indoor unit - Zone1 room temp. (TH1A) −39–88 °C

505 Indoor unit - Ref. liquid temp. (TH2) −39–88 °C

506 Indoorunit-Returnwatertemp.(THW2) −39–88 °C

507 Indoor unit - Zone2 room temp. (TH1B) −39–88 °C

508 Indoorunit-DHWtankwatertemp.(THW5) −39–88 °C

509 Indoorunit-Zone1owwatertemp.(THW6) −39–88 °C

510 Indoor unit - Outside air temp. (TH7) −39–88 °C

511 Indoorunit-Flowwatertemp.(THW1) −39–88 °C

512 Indoorunit-Zone1returnwatertemp.(THW7) −39–88 °C

513 Indoorunit-Zone2flowwatertemp.(THW8) −39–88 °C

514 Indoorunit-Zone2returnwatertemp.(THW9) −39–88 °C

515 Indoorunit-Boilerflowwatertemp.(THWB1) −40–140 °C

516 Indoorunit-Boilerreturnwatertemp.(THWB2) −40–140 °C

540 Flowrateoftheprimarycircuit 0–100 L/min

550 Indoor unit - Error postponement history 1 (latest)

Displays postponement code.

("––"isdisplaysifnopostponementcodeispresent.)

—

551 Indoor unit - Operation control at time of error 0 Standard, 1 Heater, 2 Boiler —

552

Indoor unit - Operation mode at time of error 0:OFF,1:DHW,2:Heating,3:Cooling, 4:Legionellapreven-

tion,5:Freezeprotection,6:Operationstop,7:Defrost

—

553 Indoorunit-Outputsignalinformationattimeoferror Refer to detail contents described hereinafter. —

554 Indoorunit-Inputsignalinformationattimeoferror Refer to detail contents described hereinafter. —

555 Indoor unit - Zone1 room temp. (TH1A) at time of error −39–88 °C

556 Indoor unit - Zone2 room temp. (TH1B) at time of error −39–88 °C

557 Indoor unit - Ref. liquid temp. (TH2) at time of error −39–88 °C

558 Indoorunit-Flowwatertemp.(THW1)attimeoferror −39–88 °C

559 Indoorunit-Returnwatertemp.(THW2)attimeoferror −39–88 °C

560 Indoorunit-DHWtankwatertemp.(THW5)attimeoferror −39–88 °C

561 Indoorunit-Zone1flowwatertemp.(THW6)attimeoferror −39–88 °C

562 Indoorunit-Zone1returnwatertemp.(THW7)attimeoferror −39–88 °C

563 Indoorunit-Zone2flowwatertemp.(THW8)attimeoferror −39–88 °C

564 Indoorunit-Zone2returnwatertemp.(THW9)attimeoferror −39–88 °C

565 Indoorunit-Boilerflowwatertemp.(THWB1)attimeoferror −40–140 °C

566 Indoorunit-Boilerreturnwatertemp.(THWB2)attimeoferror −40–140 °C

567

Indoor unit - Failure (P1/P2/L5/L8/Ld) thermistor 0: Failure thermistor is none, 1: TH1A, 2: TH2, 3: THW1, 4:

THW2, 5: THWB1, 6: THW5, 7: THWB2, 8: TH1B, A: THW6, B:

THW7, C: THW8, D: THW9

—

568 Mixingvalveopeningstepattimeoferror 0–10 Step

569

OperatedFlowswitchattimeoffailure(L9) 0:Nooperatedflowswitch,1:Flowswitch1,2:Flowswitch2,

3:Flowswitch3

—

571 Flowrateattimeoferror 0–100 L/min

OCH570C

Brand	Mitsubishi
Model	EHST20C-VM2C
Category	Heat Pump
Language	English

Mitsubishi EHST20C-VM2C User Manual

Table of Contents

Questions and Answers:

Mitsubishi EHST20C-VM2C Specifications

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