Fault Rectification Guide

Quick fixes and reset rituals for common EMU faults. Tap a heading to expand.

Symptoms

  • Carriage shows red on TMS without fault code.
  • HVAC screen has no temperature and flashes red.

Fix

  • M1/M2: Back wall cabinet, B side — breaker labeled “Cab HVAC Control” or “Saloon HVAC Control.”
  • T Car: C1 electrical cabinet (M1 end) — breaker labeled “Saloon HVAC Control.”
  • Use the Common Menu → Controls page to reset the affected unit.

Soft Reset

  • Common Menu → Controls page.

Hard Reset

  • Shut down and restart unit.
  • Old method (inactive): Circuit breaker in T Car’s C1 cabinet labeled “ETCS Reset.”
  • TB handle in coast, reverser neutral, park brake on.
  • Only move reverser forward when prompted by ETCS brake test.
  • Maximum 3 resets per service; the 3rd must be a hard reset.
  • Performed on TU1 or TU2 menus of the Controls page.
  • Reinstatement can take up to 2 minutes.
  • On the Loops page, press the BCU fault message (white border) in the relevant loop.
  • Successful: message turns red → yellow.
  • Unsuccessful: remains red — degraded mode required.
  • Complete BCU failure may require auxiliary brake + degraded mode to move.
  • Open the VCB.
  • Reset the breaker for the relevant APS/CVS in M2 cabinet (labelled 1 or 2).
  • Close the VCB.

6-Car

  • Activate emergency brake bypass switch.
  • Activate ETCS bypass in active and rear intermediate cabs.
  • Activate degraded mode (40 kph limit).

3-Car

  • Same as above.
  • Use auxiliary brake to manually charge brake pipe.
  • TB handle can still apply emergency brake when bypass is used.
  • Ensure coupler head is clear of debris (dead birds common).
  • Coupler isolation switch not activated (back wall of active cab).
  • Red valve on coupler head is open.
  • A-side handle and cable free and not snagged.
  • B-side valves (front compartment) not isolated.
  • Reset the relevant breaker:
  • PIS HMI/DMI
  • ETCS HMI/DMI
  • TMS screen: COSMOS HMI/DMI
  • Attempt reset via breaker in M1 cabinet, labelled 17f01 (top row).
  • If unable to reset: enter degraded mode and verify overhead voltage with Train Control before closing VCB.

Digital

  • Drive from other end, or use degraded mode + analog TB handle.

Analog

  • Drive from other end; otherwise, recovery is required.
  • Electrical isolation: breaker labelled “Compressor Control” (110V DC section).
  • Pneumatic isolation: B side, 1st door — valves “Compressor Control” and “MR Supply.”
  • Close MR and BP valves (A-side rear + corresponding T car).
  • Isolate compressor breaker on affected carriage.
  • Isolate Brake Panel valve (BCP box, B side 2nd door).
  • Pull park brake release cables.
  • Use traction bypass in active cab to clear loops.
  • Warning: unsafe to drive from isolated carriage — no emergency brake control.
  • Isolate airbag (BCP, B side 2nd door, valve “Airbag 1”).
  • Pull ring tab on small air tanks near first bogie until empty.
  • Reinstate valve after move to reinflate.
  • Use degraded mode to keep pantograph raised — auxiliary compressor usually maintains supply.
  • Attempt reset via breaker in M1 car (400V section labeled “Transformer Oil Pump”).
  • 3-Car: Requires recovery.
  • 6-Car: Can proceed; activate battery rescue switches in both intermediate cabs.
  • Cancel door release with circuit breaker.
  • Cab key: OFF → door closes → ON again.
  • Use door loop bypass to clear traction loop.
  • Advise Train Control.
  • Attempt to uncouple and recouple (setback coupling allowed).
  • If unresolved: enter degraded mode.
  • If still immobile: trailing unit must be towed dead (no degraded mode required).
  • Pneumatic isolation: turn bogie valve in small BCP hatch to horizontal.
  • Isolates airflow to brake chamber; park brake unaffected.
  • Bogie 1 isolation in M car disables analog brake cylinder gauge—use TMS or external indicators (Red = brakes on, Green = released).
  • More than 1 bogie isolated in a 3‑car = out of service.
  • 6‑car: max 2 bogies per 3‑car (4 total). More than 2 in one unit requires degraded mode (TMS prevents BP recharge).
  • M cars: switch below ETCS screen.
  • T car: switch in C1 cabinet, bottom of CB panel.
  • TMS SIFA valve: Level 3 message, no restrictions.
  • ETCS SIFA valve: Level 2 warning — cannot recharge brake pipe until ETCS isolation is performed.
  • Usually due to coupler control valve not closing.
  • If MR pressure on one unit > 700 kPa, move unit 2 m away (with authority) to close valve.
  • If leak persists: isolate coupler control valve (B side cab, in front of driver steps).