Chiller Fault Codes

Reversed phase sequence detected on incoming power at compressor startup, must trip within 0.3 s.

One or two phases of compressor current lost while running or starting; trip at <10% RLA for 2.64 s.

Loss of power for three or more line cycles detected (MPL option must be enabled). Auto-resets in 30 s.

All three phases of compressor current lost while running (previously established). Auto-resets in 10 s.

30% current imbalance on one phase relative to 3-phase average sustained for 90 continuous seconds.

Current detected on CTs when only the 1M (1K1) main contactor is closed at start, indicates shorted secondary contactor. Y-delta starters only.

Current detected on CTs when only shorting contactor (1K3) is energized, indicates shorted 1M contactor.

No CT current 1.6 s after both shorting and main contactors energized, motor not responding to start command.

Solid State Starter (SSS) fault relay opened, internal SSS protection activated.

Adaptive Frequency Drive (AFD) fault relay opened, internal VFD protection triggered.

Transition-complete signal not received within 2.5 s of transition command. Y-delta, autotransformer, primary reactor, X-line starters.

SSS did not signal Up to Speed or End of Ramp within 2.5 s after commanding bypass, applies to SSS/AFD only.

Motor did not reach <85% RLA within maximum acceleration timer, start aborted.

Transition complete input shorted before compressor start, wiring fault.

At Speed input shorted before compressor start (SSS/AFD). Indicates wiring fault.

Transition complete input opened while compressor running, contactor auxiliary contact dropped out.

At Speed input opened while compressor running (SSS/AFD) after successful bypass.

Compressor current exceeded overload trip characteristic (must trip = 140% RLA, nominal trip at 132.5% in 30 s).

Compressor current >10% RLA detected on any phase when compressor commanded off, contactor failed to open.

Average line voltage exceeded +10% of nominal (nominal trip: 60 s at >112.5%). Auto-resets at 109% or less.

Average line voltage below -10% of nominal (nominal trip: 60 s at <87.5%). Auto-resets at 90% or greater.

Saturated evaporator refrigerant temperature (from suction pressure) dropped below Low Refrigerant Temperature Cutout (LRTC) setpoint for a 450°F-s integral.

Oil pressure ratio (PC-Po)/(PC-PE) out of acceptable range for 15 s while differential pressure >15 psiD.

Oil loss level sensor detects lack of oil in the oil tank while compressor is running.

Oil loss level sensor detects lack of oil 90 s after EXV preposition completed during pre-start. Start delayed.

System differential pressure (condenser-evaporator) below 15 psiD for >164 psiD-s, or below 23 psiD for >3000 psiD-s (non-volatile integral).

System differential pressure below 7.7 psiD, saturates the Low Diff Rfgt Press integral and invokes compressor cool-down mode.

BAS was configured as 'installed' at MP and Comm 3 LLID lost communications with BAS for 15 continuous minutes.

AFD on compressor 1A reports motor current overload condition.

AFD on compressor 2A reports motor current overload, same criteria as code 504 for circuit 2.

AFD interrupt signal failure on compressor 1A, internal drive communication failure.

Main processor successfully came out of reset and rebuilt application (power-up, software install, or reconfiguration). Informational, auto-clears.

Starter module reported stopped when it should be running, and no starter diagnostic exists. Auto-logs and clears.

Leaving chilled water temperature dropped below the Low Chilled Water Temperature Cutout setpoint (typically 36–40°F for water; lower for glycol). Non-latching auto-reset.

Condenser refrigerant pressure exceeded condenser pressure cutout setpoint (adaptive, typically 132 psiA for R-134a). Compressor unloads, then trips if not recovered.

Chiller surge detected; adaptive control is unloading compressor to prevent continued surge. Operating mode displayed as 'Surge'.

Evaporator water flow not proven within 20 minutes of pump start command (4 min 15 s if pump override). Non-latching; clears when flow returns.

Condenser water flow not proven within the configured wait period. Non-latching; clears when flow returns.

Motor winding temperature exceeds the inhibit setpoint, chiller start blocked until temperature recovers.

Suction (evaporator) pressure exceeded the high suction pressure limit, compressor may be operating in a flooded condition.

Anti-short-cycle timer preventing immediate restart after shutdown. Non-latching; auto-clears when timer expires.

Oil pressure not established during prelube period before compressor start.

Phase current imbalance detected, causing capacity limit mode. Chiller continues to run but capacity is reduced.

Communication to the Tracer building automation controller has been lost.

Oil sump pressure is below the high-vacuum inhibit threshold, chiller start blocked to protect compressor seals.

Oil temperature too low to permit safe start, typically <100°F. Oil heater must warm oil first.

Purge unit running excessively, indicating non-condensable buildup or refrigerant leak.

Compressor current has reached the active current limit setpoint, chiller is running but loading is inhibited.

Building automation system has commanded a run inhibit on the chiller.

Adaptive Frequency Drive (variable speed centrifugal) has an active fault. Drive alarm message simultaneously displayed on AdaptiView.