Copeland 3 Flashes

Medium

CoreSense — Pressure switch cycling — compressor runs only briefly, cycle interrupted by a pressure switch (Flash Code 3, yellow).

Copeland 3 Flashes: Pressure switch cycling — compressor runs only briefly, cycle interrupted by a pressure switch (Flash Code 3, yellow). This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Time delay relay or control board defective.
If a high pressure switch is present, see Flash Code 2 (condenser fan / refrigerant overcharge).

Check steps

Check time delay relay/control board.
Check condenser fan & pressure switch (see Code 2).

Affected parts

Zeitverzögerungsrelais
Druckschalter

Safety note

Isolate power before working on the control panel.

Source: Emerson AE8-1385 CoreSense Diagnostics for Copeland Scroll UltraTech Compressors (2011), Code 3 description + Table 2, p.5,10

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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Related fault codes

Pressure switch tripped (HP or LP).2 Flashes Locked rotor (compressor not turning).4 Flashes Welded contactor (runs after stop signal).8 Flashes Low voltage (supply too low).9 Flashes Long run time (efficiency warning).1 Flash Module fault (CoreSense module internal failurSolid Red