On the display
The panel reads Warning - Harmonic filter - Operation inhibited. The manuals also print this warning as “Warning - Harmonic Filter - Operation Inhibited”; the wording is identical, only the capitalisation differs. It appears in the chiller's Warning messages group.
What it means
The Compressor Motor Variable Speed Drive (VSD) Harmonic Filter has been inhibited: the program change on the VSD Screen that disables the harmonic filter from filtering has been made. The warning reports this state — a harmonic filter is present on the chiller, but it is not filtering. While the filter is inhibited, all harmonic filter data is still displayed on the panel and is valid.
Why it appears
- A harmonic filter is present and has been inhibited on the VSD Screen. The inhibit is a program change offered at SERVICE access level, and the warning appears after that change is made.
What to check
- Go to the VSD Screen and check the harmonic filter inhibit state — the manual sets this warning only when the filter has been inhibited on that screen.
- Confirm the change was a deliberate program change: disabling the filter from filtering requires SERVICE access level and is only available when the chiller is stopped.
- Read the harmonic filter data on the display — all of it is still displayed and is valid while the filter is inhibited. The Filter Details subscreen, reached at VIEW access level, provides more information about the Harmonic Filter.
- Leave any change to the inhibit state to a qualified service technician:
Harmonic filter operation must only be altered by a qualified service technician.
Setpoints and thresholds
- VSD Screen — harmonic filter inhibit: the program change that disables the harmonic filter from filtering. Access level required: SERVICE. Available only when the chiller is stopped. The warning appears after this change is made.
Reset and restart
This is an auto-reset warning — the manual lists it as Auto-reset warning
— so it resets by itself and needs no manual reset action from the panel. The inhibited state itself is a program change on the VSD Screen that must only be altered by a qualified service technician.
Questions engineers ask
What does Warning - Harmonic filter - Operation inhibited mean on a YORK YK?
It means the Compressor Motor Variable Speed Drive (VSD) Harmonic Filter has been inhibited on the VSD Screen, so the filter is present but is not filtering. All harmonic filter data is still displayed and remains valid.
Why does my YORK YK show the harmonic filter operation inhibited warning?
Because the filter-inhibit program change was made on the VSD Screen at SERVICE access level, and the message appears after that change. The option is only available while the chiller is stopped.
How do I clear Warning - Harmonic filter - Operation inhibited on a YK chiller?
It is an auto-reset warning, so it resets by itself with no manual reset step. Any change to the inhibited state is a VSD Screen program change that only a qualified service technician should make.
Can I still see harmonic filter data while the filter is inhibited?
Yes. The manual states that all harmonic filter data is still displayed and is valid, and the Filter Details subscreen at VIEW access level provides more information about the Harmonic Filter.
Messages next to this one
Source
Written from the manufacturer's manuals for the YORK YK; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YK messages: fault codes · YORK YK documentation · YORK manuals