Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 133

Checking code Meaning, detecting method
5101 Discharge <Other than THHS>
1 A short in the thermistor or an
(TH1)
open circuit was sensed. The
5102 Low outdoor unit switches to the
pressure temporary stop mode with re-
saturation starting after 3 minutes, then if
(TH2) the temperature detected by the
thermistor just before restarting
5105 Heat
is in the normal range, restart-
exchanger
ing takes place.
2 If a short or open circuit in the
inlet pipe
(TH5)
thermistor is detected just be-
fore restar ting, error code
5106 Ambient
"5101", "5102", "5103", "5104",
tempera-
"5105", "5106", "5108", "5109"
ture (TH6)
or "5112" is displayed.
3 In the 3 minute restart mode,
5107 Heat
the abnormal stop delay LED is
exchanger
displayed.
outlet pipe 4 The above short or open circuit
(TH7)
is not detected for 10 minutes
after the compressor starts, or
5108 SC coil
for 3 minutes during defrosting
bypass
or after recovery following de-
outlet
frosting.
(TH8)
<THHS>
If a heat sink (THHS) temperature
of -40°C is detected just after the
5110 Radiator
inverter starts or during inverter
panel
operation.
(TH HS)
5111 1. When short (high temp. inlet) or
open (low temperature inlet) of
Liquid inlet
thermistor is detected during
(TH11)
operation, error stop will be
commenced displaying "5111"
or "5112", "5113" or "5114", or
"5115" or "5116.
2. The above detectection is not
Bypass
made during defrostig and 3-
outlet
minute after changing operation
(TH12)
mode.
Bypass
inlet
(TH15)
Intermedi-
ate section
(TH16)
Cause
1) Thermistor
2) Lead wires are being pinched.
3) Insulation is torn.
4) A connector pin is missing, or there
is faulty contact.
5) A wire is disconnected.
6) The thermistor input circuit on the
MAIN circuit board is faulty.
(In the case of the THHS, replace
the INV board.)
Short Circuit Detection
TH1 240°C or higher (0.57 kΩ)
TH2 70°C or higher (1.71 kΩ)
TH5 110°C or higher (0.4 kΩ)
TH6 110°C or higher (0.4 kΩ)
TH7 110°C or higher (1.14 kΩ)
TH8 70˚C or higher (1.14 kΩ)
THHS –
1) Thermistor trouble.
2) Biting of lead wire.
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire.
6) Faulty thermistor input circuit of
control board.
Short Detected
TH11 110°C or more (0.4 kΩ)
TH12 110°C or more (0.4 kΩ)
TH15 70°C or more (1.14 kΩ)
TH16 70°C or more (0.4 kΩ)
- 132 -
Checking method & Countermeasure
Check the thermistor's resistance.
Check if the lead wires are pinched.
Check for tearing of the insulation.
Check if a pin is missing on the con-
nector.
Check if a wire is disconnected.
Check the temperature picked up by
the sensor using the LED monitor.
If the deviation from the actual tem-
perature is great, replace the MAIN cir-
cuit board.
(In the case of the THHS, replace the
INV board.)
Open Circuit Detection
15°C or lower (321 kΩ)
-40°C or lower (130 kΩ)
-40°C or lower (130 kΩ)
-40°C or lower (130 kΩ)
-40°C or lower (130 kΩ)
-40°C or lower (130 kΩ)
-40°C or lower (2.5 MΩ)
Check thermistor resistance.
Check lead wire biting.
Check broken cover.
Check coming off of pin at connector.
Check broken wire.
Check sensor sensing temperature. If
it deviates from the actual temerature
seriously, replace control panel.
Open Detected
-40°C or less (130 kΩ)
-40°C or less (130 kΩ)
-40°C or less (130 kΩ)
-40°C or less (130 kΩ)