Mitsubishi MT300 User Manual

For Home Owners
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53
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'10 • HM-T-149
Alarm indications
There are many monitoring functions integrated in Hydrolution
To alert you to any malfunctions, the control computer transmits
alarm signals that can be read from the front panel display.
What happens in the event of an alarm?
■ Thebackgroundlightinginthedisplaystartsashingand
the status lamp lights red.
■ Somealarmschangeoperatingmodeto“Add.heatonly.”
and reduce the supply temperature to the minimum permitted
temperature to notify you that something is wrong.
Different types of alarms
■ Alarmswithautomaticreset(donotneedtobe
acknowledgedwhenthecausehasdisappeared).
■ Existingalarmsthatrequirecorrectiveactionbyyouorthe
installer.
■ Acompletelistofalarmsisonpage146.
Recommended actions
1. Readoffwhichalarmhasoccurredfromtheheatpump’s
display.
2. Asacustomeryoucanrectifycertainalarms.Seethetable
belowforrelevantactions.Ifthealarmisnotrectied,oris
not included in the table, contact your installer.
Alarm indications
Resetting alarms
No harm in Resetting an alarm. If the cause of the alarm
remains, the alarm recurs.
■ Whenanalarmhasbeentriggered,itcanberesetbyswitching
indoorunitoffandonusingtheswitch(SF1).
■ Whenthealarmcannotberesetusingtheswitch(SF1),the
operating mode, “Add. heat only”, can be activated to
resume a normal temperature level in the house. This is
most easily carried out by holding the “Operating mode”
button in for 7 seconds.
Check/remedy before installers/service
technicians are called
Alarm descriptionAlarm text on the display
Check that the thermostats for the radiators/
under-floor systems are not closed.
Tripped low pressure sensor.LP-ALARM
Check that the thermostats for the radiators/
under-floor systems are not closed.
Tripped high pressure sensor.HP-ALARM
Check that any circuit breakers to the outdoor
unit are not off.
Outdoor unit not powered / Communication
cut
OU power failure / OU Com. error
Check and replace any blown circuit and
main fuses.
Display not lit
Check that the circuit breakers to the indoor
unit are not off.
Check that the switch (SF1) is in normal posi-
tion (1).
NOTE
Recurring alarms mean that there is a fault in the
installation.
Contact your installer!

Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English