Low Pressure System (Lps) Malfunction - Daikin SkyAir Super Inverter 70 D Series Service Manual

Troubleshooting by Remote Controller Display / LED Display

6.17 Low Pressure System (LPS) Malfunction

E4
Remote
Controller
Display
Outdoor Unit LED HAP
Display
Applicable
RZP71~140D
Models
Method of
Continuity of the low pressure switch is detected by the safety device circuitry.
Malfunction
Detection
Malfunction Case where low pressure switch is actuated when the compressor is operating
Decision
Conditions
Supposed
<Causes related to PC board>
Causes
<Causes related to product as a whole>
Troubleshooting
152
5 H1P 4 H2P 3
Failure of low pressure switch
Low pressure switch's harness is broken or disconnected
Failure of low pressure switch's connector connection
Failure of outdoor unit PC board
Malfunction of refrigerant piping circuit
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is
LPS for
NO
safety connected to the
outdoor unit PC
board?
YES
Turn off the power supply
and check the following
after letting the
compressor rest for 2 or 3
minutes.
Does
the LPS for
NO
safety have
continuity?
YES
Is low
pressure during
YES
operation abnormally
low?
NO
SiE25-110
Connect correctly
Replace LPS without continuity.
Malfunction of refrigerant piping
circuit
Replace outdoor unit PC board.
(S1171)
Troubleshooting