YORK YMC2 — WARNING - CONDENSER OR EVAPORATOR XDCR ERROR

The panel displays WARNING - CONDENSER OR EVAPORATOR XDCR ERROR, printed exactly in this wording and capitalisation. It is listed among the warning messages of the YMC2 control panel; the action the manual assigns to it concerns only the display of the message and its release with a warning reset. In its description of this message the manual ties it to the evaporator and condenser pressure transducers.

The warning means that the evaporator pressure transducer reads a higher pressure than the condenser pressure transducer. The manual calls such a crossed reading indicative of a Condenser or Evaporator Transducer failure — one of the two pressure transducers is no longer reporting a believable pressure, so the panel flags a suspected transducer fault.

• After the chiller has been running for 10 minutes, the evaporator pressure transducer is indicating a higher pressure than the condenser pressure transducer; this crossed reading is the condition the warning reports.
• The manual attributes the crossed reading to a failure of the condenser or evaporator pressure transducer and gives no other cause.

• Detection time: the comparison between the two transducers that raises this warning is made after the chiller has been running for 10 minutes.
• Brine mode: the manual notes that this condition is not checked in Brine mode.

The message leaves the display only when two things have happened: the underlying condition has cleared, and the warning has been reset from the keypad. The manual states: This message will be displayed until the condition clears and the WARNING RESET Keypad button is pressed in OPERATOR (or higher) access mode. Pressing the WARNING RESET keypad button therefore requires at least OPERATOR access level, and the manual describes no other reset or recovery procedure for this warning.