Midea
V8
Series VRF Indoor Units
6.1.33 dE4 - Formaldehyde sensor fault
Panel, display box, and wired controller
The faulty IDU and other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
If the main control board of an IDU has lost communication with formaldehyde sensor for 2 min
See the Troubleshooting section.
dE4
Cause 2: The IDU main control board
is damaged
Cause 3: If the error cannot be cleared
after causes 1/2 have been eliminated,
the formaldehyde sensor is damaged
Replace the main
control board of the
IDU
Replace the
formaldehyde sensor
(1)
Cause 1: The formaldehyde sensor
pins are improperly connected to the
sensor control board
Properly connect the
pins
Note 1:
1) The formaldehyde sensor pins should be inserted on the sensor control board according to the wiring
nameplate.
2) When inserting and removing the sensor, do not touch or squeeze the white sensor film with your hand.
3) When inserting and removing the sensor: Operators must keep their hands clean and dry; the antistatic
wrist strap should be worn on the wrist; the metal piece inside the antistatic w rist strap should be in close
contact with the skin; and the metal clamp of the antistatic wrist strap should be placed at the exposed
copper grounding wire.
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