Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 116

Checking code Meaning, detecting method
4260 Cooling fan If the heat sink temperature (THHS)
abnormality 60°C for 20 minutes or longer just
before the inverter starts.
5101 Discharge <Other than THHS>
(TH1) 1 A short in the thermistor or an
open circuit was sensed. The
5102 Low heat source 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
5106 Water is in the normal range, restart-
tempera- ing takes place.
ture (TH6) 2 If a short or open circuit in the
thermistor is detected just be-
5107 (THINV) fore restarting, error code
"5101", "5102", "5106", "5108",
5109 CS circuit "5109" or "5112" is displayed.
(TH9) 3 In the 3 minute restart mode,
the abnormal stop delay LED is
5110 Radiator displayed.
panel 4 The above short or open circuit
(TH HS) is not detected for 10 minutes
after the compressor starts, or
5112 Compres- for 3 minutes during defrosting
sor shell or after recovery following de-
tempera- frosting.
ture <THHS>
(TH10) If a heat sink (THHS) temperature
of –40°C is detected just after
the inverter starts or during inverter
operation.
5111 Liquid inlet 1. When short (high temp. inlet) or
(TH11) open (low temperature inlet) of
thermistor is detected during
operation, error stop will be
commenced displaying "5111"
or "5112", "5113" or "5114", or
Bypass
"5115" or "5116.
outlet
2. The above detectection is not
(TH12)
made during defrostig and 3-
minute after changing operation
mode.
Bypass
inlet
(TH15)
Intermedi-
ate section
(TH16)
Cause
1) Same as "4230."
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)
TH6 110°C or higher (0.4 kΩ)
TH9 70°C or higher (1.14 kΩ)
THHS 100°C or higher (1.14 kΩ)
TH10 240°C or higher (0.57 kΩ)
THINV 100°C or higher (0.57 kΩ)
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)
–115–
Checking method & Countermeasure
Same as "4230."
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)
–20°C or lower (2.5 MΩ)
–15°C or lower (1656 kΩ)
–20°C or lower (1656 kΩ)
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)