Compass Pro / Clarus controls use the Clarus “alarm text” system. In practice you’ll see either a numbered error (01, 10, 13, etc.) and/or the plain-English alarm text on the display (NO WATER, NOT DRAINED, NO MOTOR COMM…). The list below is straight from the Clarus/Compass Pro troubleshooting docs, and it matches what you’ll see in the field. laundry365.co.uk+2laundry365.co.uk+2
I’m grouping by system so it’s easier to train techs.
1) Water fill / level errors
01 – ERROR. NO WATER (Alarm text: NO WATER)
Meaning: Water level didn’t reach target within allowed time. laundry365.co.uk
Likely causes
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Closed supply valve / low building pressure
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Plugged inlet screens
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Bad fill valve coil or wiring
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Level sensing issue (pressure tube/air bell leak or blockage)
Diagnosis
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Verify both wall valves fully open; confirm pressure/flow at hose.
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Pull and clean inlet screens at valve body.
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In service test, command cold/hot fill separately; check for valve “click” and flow.
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Inspect pressure hose from tub to control for cracks, kinks, water in hose, loose fit.
06 – ERROR. WATER IN MACHINE (Alarm text: WATER IN DRUM)
Meaning: Control sees level above EMPTY at program start. laundry365.co.uk
Likely causes
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Residual water from poor drain
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Slow siphon/backflow from standpipe
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Level system reading high (air trap blocked)
Diagnosis
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Run drain test and confirm tub truly empties.
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Check standpipe height and for backflow/gurgling.
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Pull pressure hose and air trap; clean if sludge/soap buildup.
07 – ERROR. OVER-FILLED (Alarm text: MACHINE OVER-FILLED)
Meaning: Level above overfill threshold. laundry365.co.uk
Likely causes
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Fill valve stuck open or debris in valve seat
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Pressure hose off / punctured / blocked
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Faulty pressure sensor
Diagnosis
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Shut water supply mid-fill:
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If water keeps rising → valve stuck open.
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If level stops → suspect level sensing.
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Inspect/replace valve; verify pressure system is airtight and clear.
14 – ERROR. LEVEL ADJUST (Alarm text: LEVEL CALIBRATION)
Meaning: Factory calibration values missing/out of range; machine uses defaults. laundry365.co.uk
Likely causes
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Control replaced without calibration
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EEPROM/config corruption
Diagnosis
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Enter service mode and perform level calibration procedure.
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If calibration won’t “take,” suspect control memory/board.
27 – ERROR. LEVEL OFFSET (Alarm text: AUT. LEVEL CALIB.)
Meaning: Pressure sensor value too far from empty reference to auto-calibrate. laundry365.co.uk
Typical causes
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Pressure tube partially blocked with detergent residue
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Tube leaking or loose
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Sensor drift
Diagnosis
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Remove/clean pressure hose + air trap.
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Leak-check hose and fittings.
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Re-run calibration.
28 – ERROR. LEVEL NOT CALIBRATED
Meaning: Level system never calibrated in service mode before use. laundry365.co.uk
Fix: Run service-mode calibration.
2) Door / safety interlock errors
02 – ERROR. OPEN DOOR (Alarm text: DOOR OPEN)
Meaning: Door-closed microswitch signal missing during run. laundry365.co.uk
Likely causes
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Door not seating square (hinge sag / striker wear)
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Door closed switch failed
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Harness break at hinge
Diagnosis
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Check mechanical alignment first.
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In service I/O view, verify “door closed” input toggles.
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Meter switch and harness continuity.
03 – ERROR. DOOR LOCK (Alarm text: DOOR UNLOCKED)
Meaning: Door-locked microswitch signal missing when locked. laundry365.co.uk
Likely causes
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Lock wax motor/solenoid weak
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Lock switch failed
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Wiring to lock
Diagnosis
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Command lock in diagnostics; confirm lock actuates and feedback changes.
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Meter lock coil and microswitches.
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Inspect connector for heat/corrosion.
17 – ERROR. DOOR LOCK SWITCH (Alarm text: DOOR LOCK)
Meaning: Control sees “door locked” even though “door closed” isn’t confirmed. laundry365.co.uk
Likely causes
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Stuck lock switch
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Shorted harness
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I/O card fault
Diagnosis
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Disconnect lock harness; see if state clears.
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If not, suspect I/O/input circuitry.
20 – ERROR. EWD INTERLOCK (Alarm text: INTERLOCK STATUS)
Meaning: Motor controller not receiving proper door-lock interlock. laundry365.co.uk
Likely causes
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Door lock feedback line broken
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I/O board output issue
Diagnosis
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Verify interlock signal at MCU connector during lock.
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Check I/O board output & cabling.
26 – ERROR. DOOR SWITCH, TILT (Alarm text: DOOR SWITCH, TILT)
Meaning: “Door closed” signal present while S25 (lock open) indicates unlocked. laundry365.co.uk
Diagnosis
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Usually wiring/switch logic mismatch → inspect lock & door switches together.
15 – ERROR. EMERGENCY STOP (Alarm text: EMERGENCY STOP)
Meaning: E-stop circuit opened. laundry365.co.uk
Diagnosis
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Confirm E-stop button reset and circuit continuity to control.
3) Drain / unbalance errors
10 – ERROR. REMAINING WATER (Alarm text: NOT DRAINED)
Meaning: After drain sequence, level still above EMPTY. laundry365.co.uk
Likely causes
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Coin trap / sump clogged
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Drain hose kink or undersized standpipe
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Weak pump or pump obstruction
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Building drain backing up
Diagnosis
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Run drain test: strong steady outflow expected.
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Clean trap/sump; inspect impeller.
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Verify hose & standpipe height/flow.
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If voltage present at pump but flow weak → replace pump.
11 – ERROR. UNBALANCE SWITCH (Alarm text: UNBALANCE SENSOR FAULT)
Meaning: Unbalance switch closed when starting drain sequence. laundry365.co.uk
Likely causes
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Machine not level / poor floor
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Worn shocks/springs
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Bad unbalance switch
Diagnosis
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Confirm level and anchoring.
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Inspect suspension.
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Test switch operation in service mode.
4) Temperature / heating errors
04 – ERROR. LOW TEMPERATURE (Alarm text: NTC LOW TEMP)
Meaning: Temp sensor open circuit or reading below limit. laundry365.co.uk
05 – ERROR. HIGH TEMPERATURE (Alarm text: NTC HIGH TEMP)
Meaning: Temp sensor shorted or reading above limit. laundry365.co.uk
08 – ERROR. NO HEAT (Alarm text: NO HEATING)
Meaning: Temp didn’t rise fast enough within max heating time. laundry365.co.uk
Shared diagnosis for 04/05/08
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Measure NTC resistance and compare to temp/resistance chart in service manual.
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Check heater element resistance and insulation-to-ground.
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Verify heater output/contactor is being energized by control during heat step.
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Confirm stable water level (machine may inhibit heat if level is unstable).
5) Communication / network / I/O errors
18 – ERROR. START NOT ALLOWED (Alarm text: START NOT ALLOWED)
Meaning: External payment/network system blocking start. laundry365.co.uk
Diagnosis
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Check network permissions, price system status, comm cable.
19 – ERROR. MIS COMMUNICATION (Alarm text: MIS COMMUNICATION)
Meaning: Machine lost contact with network. laundry365.co.uk
Diagnosis
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Verify comm cable on X7 / network node.
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If cable OK, problem is upstream in laundromat control system.
21 – ERROR. I/O COMMUNICATION (Alarm text: I/O COMMUNICATION)
Meaning: CPU ↔ I/O board comms interrupted. laundry365.co.uk
Diagnosis
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Reseat flat/ribbon cables and plugs between boards.
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Inspect for moisture/corrosion.
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If persistent, swap I/O board then CPU board.
6) Drive / motor / inverter errors
These show as “ERROR CODES FROM MOTOR” with a 31–41 subcode. laundry365.co.uk
13 – ERROR. MOTOR COMMUNICATION (Alarm text: NO MOTOR COMM)
Meaning: PCU ↔ motor control unit comms lost. laundry365.co.uk
Diagnosis
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Power cycle and run spin test.
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Check comm harness to MCU, reseat.
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If motor test fails with good harness → MCU/inverter.
31 – Heat sink too hot (Alarm: HEAT SINK TOO HOT)
Meaning: MCU control circuits overheating. laundry365.co.uk
Diagnosis
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Check airflow/blocked vents.
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Look for repeated overload / high ambient heat.
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MCU may be failing thermally.
32 – Motor too hot (Alarm: MOTOR TOO HOT)
Meaning: Motor thermal protection tripped. laundry365.co.uk
Diagnosis
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Verify load size, check for tub/bearing drag.
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Measure motor winding balance; inspect for overheating signs.
33 – No interlock (Alarm: NO INTERLOCK)
Meaning: Motor got start command but didn’t get door-lock interlock. laundry365.co.uk
Diagnosis
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Trace door-lock interlock line to MCU.
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Often a wiring/lock feedback problem, not a motor problem.
35 – Motor shorting (Alarm: MOTOR SHORTNING)
Meaning: Short between windings or to earth. laundry365.co.uk
Diagnosis
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Megger phase-to-ground.
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Ohm windings phase-to-phase; must be equal.
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If shorted → motor.
36 – Interlock hardware (Alarm: INTERLOCK HARDWARE)
Meaning: Fault in MCU interlock receiving circuitry. laundry365.co.uk
Diagnosis
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If interlock wiring/lock proven good → MCU fault.
37 – Low DC voltage (Alarm: LOW DC VOLTAGE)
38 – High DC voltage (Alarm: HIGH DC VOLTAGE)
39 – Ripple on DC bus (Alarm: RIPPLE ON DC BUS)
Meaning: DC bus unstable/out of range. laundry365.co.uk
Diagnosis
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Measure incoming line voltage under spin load.
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Check for loose lugs, burned connectors, weak supply.
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If supply clean → MCU DC bus capacitors failing.
40 – Line interrupt / phase missing (Alarm: LINE INTERRUPT)
Meaning: One phase missing at MCU. laundry365.co.uk
Diagnosis
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Confirm all phases present at MCU input during run.
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Trace back to contactor/fuses/terminal block.
41 – Klixon circuits / motor temp HW fault (Alarm: KLIXON CIRCUITS)
Meaning: Thermal monitoring circuit hardware fault. laundry365.co.uk
Diagnosis
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Check motor thermal switch wiring and continuity.
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If OK, points to MCU sensing input.
Quick “teach-the-tech” rule of thumb
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01/06/07/10/27/28 → water level system (supply, valves, drains, pressure hose, calibration).
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02/03/17/20/26 → door/lock or its wiring.
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13/31–41 → drive system (power quality, motor, MCU/inverter, interlock line).
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18/19/21 → network/I/O/controls.