Air/Air Heat Pump Operation In Ther- Mistor Error - Sharp AY-ZP35PR Service Manual

Function
29 PAM clock error When power source frequency
cannot be determined (at start-
up), or when power source clock
cannot be detected for 1 contin-
uous second (at startup).
1—A single error judgment results in the display of the indoor unit error (complete shutdown).
2—The outdoor unit restarts four times before the indoor unit error is displayed (complete shutdown).
3—The outdoor unit restarts eight times before the indoor unit error is displayed (complete shutdown).
[2] AIR TO AIR HEAT PUMP OPERATION IN THERMISTOR ERROR
1. Indoor unit
Item Mode
Room temperature Auto
thermistor (TH1)
Cooling
Dehumidifying
Heating
Heat exchanger Cooling
thermistor (TH2) Dehumidifying
Heating
Description Detection period
At compressor startup,
when in operation
Control opera-
tion
Operation mode
judgment
Frequency control
Room temperature
memory
Frequency control
Frequency control
Freeze prevention
Cold air prevention
Operation
Reset condition
Compressor continues
operation without stop-
ping.
When resistance Short-circuit
is low (tempera-
ture judged high-
er than actual)
Cooling mode is ac- Cooling mode is acti-
tivated even if room vated in most cases.
temperature is low.
Room becomes too Air/air heat pump
cold. operates in full
power even when
set temperature is
reached.
Normal operation. Room temperature
is stored in memo-
ry as 31.0°C, and
compressor does
not stop.
Room does not Hot keep status
become warm. results immediate-
ly after operation
starts.
Frequency does not
increase above 30
Hz (40 Hz).
Indoor unit evapora- Indoor unit evapora-
tor may freeze. tor may freeze.
Cold air prevention Compressor oper-
deactivates too soon ates at low speed or
and cold air dis- stops, and frequency
charges. does not increase.
3-3
AY-ZP35PR
Self-diagnosis result
display
Indoor Indoor unit
unit error
display
None Yes Yes
When resistance Open-circuit
is high (tempera-
ture judged lower
than actual)
Heating mode is ac- Heating mode is
tivated even if room always activated.
temperature is high.
Room does not Compressor does
become cool. not operate.
Normal operation. Room temperature
is stored in memo-
ry as 18.5°C, and
compressor does
not operate.
Room becomes too Air/air heat pump
warm. operates in full
power even when
set temperature is
reached.
Compressor stops Compressor does
occasionally. not operate.
Cold air prevention Cold air prevention
deactivates too slow. does not deactivate,
and indoor unit fan
does not rotate.
Outdoor
unit