C17] Or [Outdoor C17] Error Appears On [Alarm List] Screen; C19] Error Appears On [Alarm List] Screen; Disc.] Error Appears On [Alarm List] Screen - Panasonic CZ-256ESMC3 Technical Data Manual

Fault diagnosis

1-2. [C17] or [Outdoor C17] error appears on [Alarm list] screen

1 Detection method
If the communication adaptor cannot receive data from the indoor or O/D unit for a certain period of time or
longer, or if an error is detected in the received data.
2 Diagnosis of failure
1. Unit 1-1 Is there a unit that is turned off?
1-2 Is there looseness, a disconnection, an open circuit, or a short
1-3 Are there any of the following types of deficiencies in the
2. Intelligent Controller 2-1 Is there looseness, a disconnection, an open circuit, or a
3. Replace the communication adaptor board for which there is an alarm
Or, replace the product main unit

1-3. [C19] error appears on [Alarm list] screen

1 Detection method
When there are multiple adaptors with the same address in one communication adaptor control wiring system.
2 Diagnosis of failure
1. Communication 1-1 Is there more than one adaptor with the same address in one
adaptor
2. Communication 2-1 Are there any of the following types of deficiencies in the
adaptor
control wiring
3. Replace the adaptor board for which there is an alarm
Or, replace the product main unit
* After correctly setting the adaptor address, perform [Check configuration] on the Intelligent
* [Check configuration] is displayed under [Settings] → [System settings].

1-4. [Disc.] error appears on [Alarm list] screen

1 Detection method
It is the same as for "1-1. [C06] error appears on [Alarm list] screen". However, if an air conditioner is connected
to the communication adaptor, a "Disc." error is displayed on that air conditioner (Indoor unit, Outdoor unit).
2 Diagnosis of failure
Refer to "2 Diagnosis of failure" in 1-1.
circuit in the inter-unit control wiring connection?
construction of the inter-unit control wiring?
· Running in parallel with power lines
· Branch points exceed 16 places
· The total extension exceeds 1 km
· There is re-branching after branching
· There is a branch point with many branches ("star" or
"octopus" configuration)
· The distance between one branch point and the next branch
point is 2 m or less
· Defective termination resistance settings (too low or too high)
· When shielded wire is used, the shield is grounded on both
sides or not grounded
short-circuit in the wiring of 1, 2 (LINK1) or 4, 5 (LINK2) of the
Intelligent Controller's 27P terminal board?
communication adaptor control wiring system?
construction of the communication adaptor control wiring?
· Power lines and bundled lines or running in parallel
· The total extension exceeds 1 km
· It is not a crossover wiring (there is a branch point)
· Shielded wire is not used
· The shield is grounded on both sides or not grounded
Controller screen, to confirm.
1. Communication error related
ー 5 ー
Yes Turn on the
power
No 1-2
Yes Correct
wiring
No 1-3
Yes Reconstruct
properly
No 2-1
Yes Correct
wiring
No 3
Yes Modify
settings *
No 2-1
Yes Reconstruct
properly
No 3