Heat pumps · Error codes · Waterkotte
LP-faultWaterkotte · EcoTouch Ai1 Geo (5006.5-5013.5)
LP-fault on a Waterkotte EcoTouch Ai1 Geo: Fault at input side (LP fault)
Short answer
On a Waterkotte heat pump, LP-fault means: Fault at input side (LP fault). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Fault at input side (LP fault).
Likely causes:
- Faulty extraction of water or water glycol; brine circuit insufficiently vented; glycol pour point too high; evaporator contaminated/icy; refrigerant circulation interrupted (blocked valves, contaminated filter dryer); dirt trap clogged; heat source temperature too low.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Note the code and any text shown on the display/controller.
- Check the heat pump isolator and consumer-unit breaker are on.
What the engineer will check
- Work through listed causes: Faulty extraction of water or water glycol; brine circuit insufficiently vented; glycol pour point too high; evaporator contaminated/icy; refrigerant circulation interrupted (blocked valves, contaminated filter dryer); dirt trap clogged; heat source temperature too low.
Who to ask for: heat pump engineer.
Sources
- Waterkotte EcoTouch Ai1 Geo / EcoTouch DS 5018 Ai - Planning and Installation Manual (21.11.2015, Z20469) ↗ · Z20469 · page 63 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026