Troubleshooting - Hitachi RWM-2R1E Installation & Operation Manual

And yutaki cascade controller

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Installation & operation manual (364 pages)

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Table of Contents

TROUBLESHOOTING

9 TROUBLESHOOTING

N O T E

•

(o): Option configurable from Unit controller. This alarm will be displayed if the system has been configured.

•

o: Default. This alarm will be displayed in the Unit controller.

•

–: No applicable.

Alarm code indication on remote control switch:

Alarm indication

Alarms for Indoor units:

Retry

Alarm

Stop

YUTAKI S

Code

–

(o)

154

PMML0575 rev.1 - 09/2021

Alarm code

YUTAKI S

Origin

COMBI

Communication

Indoor

(o)

Indoor

(o)

Indoor

(o)

Indoor

(o)

Indoor

(o)

Indoor

Detail of Abnormality

Transmission Alarm (Not outdoor unit

detected)

2n DHW thermistor anomaly

Water inlet thermistor abnormally

(THMwi)

Water outlet thermistor abnormally

(THMwo)

Indoor Liquid Pipe Temp Thermistor

Abnormality (THMl)

Indoor Gas Pipe Temperature

Thermistor Abnormality (THMg)

Water Circuit 2 thermistor abnormally

(THMwo2)

Water DHW thermistor abnormally

(THMdhwt)

Auxiliary sensor 2 thermistor

abnormally (THMaux2)

Auxiliary sensor 1 thermistor

abnormally (THMaux1)

Water Plate HEX pipe thermistor

abnormally (THMwohp)

Auxiliary sensor 3 thermistor

abnormally (THMaux3)

Water pressure sensor (WPS)

abnormality

Incorrect LCD setting

Main Factors