6. Failure Phenomenon: Two way air exchange lamp blinks
<Situation> Two way air exchange lamp blinks (lit for 4 seconds and off for 1 second).
Dirt sensor is not functioning.
“Timer lamp blinks 17 times” is not stored in the self-diagnosis memory.
<Assumed points of failure> Incomplete insertion of the connector of dirt sensor (Gas sensor) board
Dirt sensor
<Caution> Self-diagnosis (failure detection) of dirt sensor is performed at the time when automatic two way air exchange is
set.
<Diagnosis flow>
Troubleshooting start
Is the connector (CN9) of the dirt sensor board inserted
securely? Is there wiring disconnection?
Yes
No
Replace “dirt sensor board”.
Repair connector or wiring.
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