KGHV Dominator Series – E6 Fault: “Inner and Outer Board Communication”
Possible Safety Float Triggered by Full Condensate Tray
Condensate Pump Spacer (Part 655540RP)
Overview
The E6 fault (shown as “inner and outer board communication” on XE71 or “inner and outer board com” on LE60) normally indicates PCB communication issues.
However, it can also be triggered by the safety float switch if the condensate tray fills, particularly during cooling mode.
Recent field reports on later-build Dominator V2 units show that insufficient pump suction clearance can slow condensate removal, causing the float switch to trigger and report an E6 fault.
A field and production fix has been released - Condensate Pump Spacer (Part 655540RP).
Common Causes
Blocked Drain
• Check drainpipe is clear and unobstructed.
Low Airflow Settings
• Airflow may have been set too low during commissioning.
• Excess condensate may overwhelm the tray and pump.
Pump Issues
• Impeller blocked by debris.
• Bent pump bracket or pump sitting flush on tray floor.
• Pump requires approx. 5 mm clearance from tray base.
Float Switch Mounting
• Should be positioned 8–10 mm above tray base.
• Incorrect mounting may cause early triggering.
Important Note
There is no user reset for this fault.
Once triggered:
• Indoor fan and condensate pump are locked out.
• Unit will not recover until manually reset or water evaporates (hours to days).
Technician Procedure – Reset Fault & Apply Corrective Fix
Recommended Parts
- Condensate Pump Spacer – Part# 655540RP
- 2 x Large Flat (Mud Guard) Washers included with pump spacer
1. Clear / Reset the Fault
- Remove the access panel to the pump.
- Manually hold the float switch down to clear the lockout.
- Run unit in Fan‑Only mode to activate drain pump.
- Verify pump operation:
• Confirm water evacuation.
• Check for good flow and no obstructions.
2. Install the Condensate Pump Spacer (Part 655540RP)
The pump spacer provides approx. 4 mm clearance to prevent the pump from sealing against the tray.
- If the pump is sitting flush on the tray base:
• Clip the spacer onto the bottom of the pump.
3. Additional Fitment Requirements
6. Enlarge Pump Mounting Holes
• On Water Tray, enlarge pump mount holes to 10 mm.
• This allows vertical adjustment after the spacer is installed.
7. Fit Large Flat (Mud Guard) Washers (supplied in Part# 655540RP)
• The 2 × 4 mm screws securing the pump must have wide washers.
• Prevents screws pulling into the enlarged holes.
4. Pump Height / Alignment Adjustment
- After spacer installation:
• If the pump is bottomed out on the tray:
– Spacer is mandatory.
• If the pump leans outward after pump spacer fitment:
– Use the 10 mm holes to raise the pump a few mm until level.
Important:
• Remove all swarf from the tray after drilling.
• Debris may be sucked into the pump, causing further faults.
- Confirm the pump is level and has correct clearance.
- Release float switch and refit access panel.
Unscrew the pump bracket
Lift pump assembly up and expose the inlet
Fit the Condensate Pump Spacer
Condensate pump spacer pushed all the way on
Screws removed from pump
Mount holes drilled out to 10mm
Pump re-installed with large flat (mud guard) washers and pump spacer fitted
(Image of Condensate Pump Spacer Part No. 655540 and installation position here)
For external installations where the side pump access panel cannot be accessed, you can instead remove the end panel and raise the pump mounting height by removing the rubber block from the top of the pump.
To do this, remove the screws on the top of the pump and lower the pump to take out the rubber pad. When refitting the pump with the spacer installed, removing this pad raises the pump by the pad’s thickness, allowing it to sit level.
Click here to view Video - How to raise Pump Height by Removing Rubber Block