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Fagor and Domus Fault Codes and How to Fix Them

Written by jd

Nov 25, 2025

(615) 885-1115

Here’s a practical, field-focused list of the most common Fagor Industrial and Domus washer-extractor alarms you’re likely to see (OPL and coin models), plus how to diagnose/fix them fast. These brands share a lot of the same fault “families,” but I’ll keep the codes as each control typically shows them.

Fagor Industrial (TP2 / LAP / Touch platforms) — common alarms & fixes

On TP2/LAP controls the alarm menu highlights these as the core wash-stopping faults:
E3 Drainage failure / water in tub, E4 Max water level, E5 Water inlet fault, E6 Heating fault. ManualsLib
Those four account for the majority of service calls.

E5 — Water Inlet Fault

Meaning: Machine didn’t reach target level in time (slow/no fill). ManualsLib
Top causes

  • Building valves not fully open / low pressure

  • Inlet screens clogged with grit/scale

  • Failed inlet valve coil

  • Level/pressure hose leak or blockage

Fix / diagnosis

  1. Verify hot/cold wall valves open; confirm decent flow at hose.

  2. Remove hoses and clean inlet screens at valve body.

  3. In Autotest / Outputs, command cold then hot fill; listen for valve click and verify flow.

  4. Inspect pressure tube/air trap for kinks, soap sludge, pinholes, loose fit.

E3 — Drainage Failure / Water in Tub

Meaning: Water level not dropping to “empty” within drain time (or still water at end). ManualsLib
Top causes

  • Coin trap/sump blocked

  • Drain hose kink / standpipe partially clogged or backing up

  • Weak or jammed drain pump

  • Pressure tube blocked so control “thinks” water remains

Fix / diagnosis

  1. Run drain output test — look for strong, steady discharge.

  2. Clean coin trap/sump; check pump impeller for debris.

  3. Verify drain hose routing and standpipe height/flow.

  4. If pump has correct voltage but weak/no flow → replace pump.

E4 — Maximum Water Level Reached (Overfill)

Meaning: Level rose above safety threshold. ManualsLib
Top causes

  • Fill valve stuck open (debris in seat)

  • Pressure tube off/punctured

  • Air trap blocked / pressure sensor drift

Fix / diagnosis

  1. Shut building water off while alarm is active:

    • If level keeps rising → inlet valve stuck open → clean/replace valve.

    • If level stops → level sensing problem.

  2. Clean air trap and pressure tube; ensure airtight fit to sensor.

E6 — Heating Fault

Meaning: Heating output activated but water temp didn’t rise in allowed time. ManualsLib
Top causes

  • Heater element open/grounded (electric models)

  • Steam valve/coil failure or no steam supply

  • Heater relay/contactor not closing

  • NTC/temp probe out of range

  • Unstable/low water level inhibiting heat

Fix / diagnosis

  1. Check heater resistance + insulation-to-ground.

  2. Verify heater relay/contactor energizes during heat step.

  3. Test NTC/temp probe vs temp-resistance chart; clean corroded connectors.

  4. Confirm water level is stable (machine may refuse to heat if level signal is noisy).

Domus (L-Control, D-Control, Touch II) — common alarms & fixes

Domus industrial controls use the same “ALARM Ex” style. In the Domus manuals, the most common wash-stopping alarms include:

  • E5 “FAULT HEATING” (heating system fault) ManualsLib

  • E6 “MAX. TEMP.” (over-temperature) ManualsLib

  • E8 “MAX. WATER LEVEL” (overfill) ManualsLib

  • E12 “WATER IN TUB” (water remains, door stays locked) ManualsLib

ALARM E12 — Water in Tub / Not Drained

Meaning: Program ended or drain phase timed out but level still above empty. Door won’t open till drained. ManualsLib
Fix / diagnosis

  • Same drain checklist as Fagor E3: clean trap/sump, verify hose/standpipe, test pump output, clear pressure tube.

ALARM E8 — Maximum Water Level (Overfill)

Meaning: Safety overfill threshold reached. ManualsLib
Fix / diagnosis

  • Same approach as Fagor E4: check for stuck inlet valve vs bad level system.

  • Clean air trap/pressure line; replace valve or sensor as indicated.

ALARM E5 — Fault Heating

Meaning: Control called for heat but temperature didn’t rise fast enough. ManualsLib
Fix / diagnosis

  1. Verify heat source: electric element OK / steam present and valve opens.

  2. Check heater contactor/relay output from board.

  3. Test temp sensor (NTC/PT100 depending on model).

  4. Confirm correct water level before heating step.

ALARM E6 — Max Temperature

Meaning: Water exceeded safe max temp (manual example notes >95°C). ManualsLib
Top causes

  • Steam valve sticking open

  • Heater relay welded closed

  • Temp sensor out of calibration

Fix / diagnosis

  • Verify steam valve closes when commanded (watch/hear it in service test).

  • Check heater relay/contactor for stuck contacts.

  • Test/replace temp sensor if reading high vs actual water temp.

Quick “tech rule” for both brands

  • E5 (fill) → supply valves/pressure → inlet screens → valve coils → pressure tube/air trap.

  • E3/E12 (drain) → trap/sump → pump/impeller → hose/standpipe → pressure tube.

  • E4/E8 (overfill) → stuck inlet valve or bad level sensing.

  • E6 (heating/max temp) → heater/steam valve → contactor/relay → temp sensor → stable water level.

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