E6 Fault Code – WSHV‑S / WSHV‑T Indoor–Outdoor Communication & Model Mismatch Error

⚠️ Safety Notice – Reverse Cycle Air Conditioners

This equipment must only be installed, commissioned, serviced and repaired by suitably qualified and licensed personnel.

Before commencing work, complete a task-specific risk assessment and ensure electrical isolation procedures, safe access, adequate service clearances and appropriate PPE have been considered. All work must comply with applicable regulations, standards and manufacturer requirements.

Particular care must be taken when working around electrical systems, refrigerant circuits, moving parts, roof spaces, ceiling spaces, confined spaces and working-at-heights hazards where applicable.

Do not proceed if safe access, required clearances, confined space risks or appropriate safety controls cannot be achieved and maintained. 

Safety takes priority over diagnosis, repairs, installation schedules and customer expectations. If the task cannot be completed safely, it must not proceed until the risks have been adequately controlled.

Applies To

✅ Braemar WSHV Series 

• WSHV‑S Airvolution™ Wall Split
• WSHV‑T Airvolution™ Wall Split

❌ Not applicable to:

• LSHV / KSHV wall splits
• SDHV / KDHV ducted systems
• Cassette, Bulkhead, Multi or Add‑On Cooling units

Source Reference

Braemar Residential Service Guide – ES E247‑A (Effective November 2023)

• WSHV‑S Series: Page 10
• WSHV‑T Series: Page 12

Fault Description

E6 indicates a communication fault caused by incorrect indoor–outdoor unit pairing within the WSHV range.

In ES E247‑A, E6 is explicitly defined only for WSHV systems and occurs when a WSHV‑S and WSHV‑T unit are incorrectly mixed.

? This is not a generic inverter communication fault across all Braemar products.

Customer Symptoms

• Indoor display shows E6
• Unit does not start or stops immediately after power‑up
• No heating or cooling operation
• Outdoor unit inoperative
• Fault appears immediately (no run time)

Confirmed Root Cause

❌ Indoor–Outdoor Model Mismatch (Design Restriction)

The service guide states:

• WSHV‑S indoor units will NOT operate with WCHV‑T outdoor units
• WSHV‑T indoor units will NOT operate with WCHV‑S outdoor units

In either scenario, E6 will be displayed and normal operation is impossible.

Diagnostic Procedure (WSHV Series Only)

Step 1 – Identify Indoor Unit Model

Check rating plate:

• WSHVxxD1S → WSHV‑S indoor
• WSHVxxD1T → WSHV‑T indoor

Step 2 – Identify Outdoor Unit Model

Check rating plate:

• WCHVxxD1S → WSHV‑S outdoor
• WCHVxxD1T → WSHV‑T outdoor

Step 3 – Confirm Correct Pairing

✅ Valid pairings

• WSHV‑S indoor ↔ WCHV‑S outdoor
• WSHV‑T indoor ↔ WCHV‑T outdoor

❌ Invalid pairings (E6 will always occur)

• WSHV‑S indoor ↔ WCHV‑T outdoor
• WSHV‑T indoor ↔ WCHV‑S outdoor

Step 4 – Power Reset

• Isolate power to indoor and outdoor
• Wait 5 minutes
• Restore power

⚠ If pairing is incorrect, E6 will reappear immediately

Step 5 – Wiring & PCB Checks (Only if Pairing Is Correct)

If correct S↔S or T↔T pairing is confirmed:

• Inspect communication wiring for damage or incorrect termination
• Check terminal tightness and polarity
• Substitute known‑good PCB if required

⚠ Do not pursue PCB replacement until pairing is confirmed correct

Resolution Summary

Key Technical Notes

• E6 in ES E247‑A is only defined for WSHV systems
• E6 is not listed in:
  • General wall split error code tables
  • Ducted split error code charts
• Treat E6 as a hard compatibility fault, not a universal comms error
• No refrigerant work is required for this fault