Daikin RY50G - Low Pressure System (LPS) Malfunction

Troubleshooting by Remote Controller Display / LED Display Si-71A
110 Troubleshooting
6.12 Low Pressure System (LPS) Malfunction
Remote Controller
Display
(7
(7(7
(7
Outdoor Unit LED
Display
A(H1P)
ñýýý
1(H2P)
ò
2(H3P)
ó
Applicable Models
R(Y)
Method of
Malfunction
Detection
Continuity of the low pressure switch is detected by the safety device circuitry.
Malfunction
Decision
Conditions
Case where low pressure switch is actuated when the compressor is operating
Supposed Causes
<Causes related to PC boaed>
„
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
<Causes related to product as a whole>
„
Malfunction of refrigerant piping circuit
Troubleshooting
Is low
pressure
during operation
abnormally
low?
NO
NO
NO
Is
LPS
for safety
connected to the
outdoor unit PC
board?
Does
the LPS for
safety have
continuity?
YES
YES
YES
Turn off the power
supply and check the
following after letting
the compressor rest
for 2 or 3 minutes.
Connect correctly
Replace HPS without continuity.
Malfunction of refrigerant piping circuit
Replace outdoor unit PC board.
(SF014)