Mitsubishi Electric LGH-250RVXT-E Handbook page 26

(5) Failure mode 5: Error code and LED display
An error code displayed on the remote controller (PZ-61DR-E, PZ-43SMF-E) or the M-NET controller, and
blinking or illumination of LED1 (green) or LED2 (red) on the circuit board show the type of an error.
The LED blink interval is 0.25 seconds for both on and off. The display duration is approximately 7 seconds.
Error display list
Error LED1 LED2
Code (green) (red)
0900
3126 8
blinks
0.25 s 0.25 s 0.25 s
ON
OFF
Error display example: Two blinks
Symptom
Trial operation The trial operation switch (SW2-1) on
the circuit board is set to "ON".
External de-
When the terminals (TM3 70) are
vice error
set for pre-heater output (function se-
lection switch (SW5-6) on the circuit
board is ON, or the function setting
(No. 58) of PZ-61DR-E set to "2"), the
following conditions were satisfied.
Outdoor air temperature detected
•
by OA thermistor stays at 70°C or
higher for one minute.
Outdoor air temperature detected by OA
•
thermistor exceeds 15°C within 15 min-
utes after the pre-heater output starts.
Outdoor air temperature is still
•
-10°C or lower one hour after the
pre-heater output starts.
Causes of the above phenomenons
are described below.
The pre-heater is connected to the
wrong terminal.
Faulty connection of the pre-heater
The output capacity of the pre-heater
is too large with respect to the air
volume of the Lossnay unit.
The output capacity of the pre-heater
is too small with respect to the air
volume of the Lossnay unit.
Even though the pre-heater is in use,
the function selection switch (SW5-6)
on the circuit board is not set to ON,
or the function setting (No. 58) of PZ-
61DR-E is not set to "2".
Even though the pre-heater is not
in use, the function selection switch
(SW5-6) on the circuit board is set to
ON, or the function setting (No. 58)
of PZ-61DR-E is set to "2".
Pre-heater failure
Pre-heater relay failure
Circuit board failure
7 s
Cause
─ 26 ─
Corrective action
Check the trial operation switch.
(See the Lossnay technical manual.)
See below.
Connect the pre-heater to the
terminals (TM3 7 0).
(See the Lossnay technical man-
ual.)
Check the pre-heater connections.
Adjust the output capacity of the pre-
heater. When the pre-heater is used,
run the Lossnay at a higher fan speed.
Adjust the output capacity of the pre-
heater. When the pre-heater is used,
run the Lossnay at a lower fan speed.
Check the setting of the function
selection switch (SW5-6) on the
circuit board or the function setting
(No. 58) of PZ-61DR-E.
(See the Lossnay technical man-
ual.)
Replace the pre-heater.
Replace the relay for the pre-heater.
Replace the circuit board.