Mitsubishi Electric Ecodan FTC7 controller (PUZ-WM/WZ, PUHZ-SW)
Mitsubishi Electric · Heat pumps · 26 codes · 19 with plain-language explanation
Guides
- How to read and reset an error on the Ecodan (FTC7) controller
The controller shows the code with unit, address and a phone number. The manual describes resetting with the F4 (RESET) and F3 (Yes) buttons; do not press buttons with sharp objects.
- Ecodan: water flow and the magnetic filter – what the installer checks for L9, L3, L6, LP
Flow-related codes often come from a restricted water circuit. The manual describes adjustments and checks that are done by the installer.
Error codes
- E0–E5 Communication failure between main remote controller and FTC with plain-language explanation
- E6–EF Communication failure between FTC and outdoor unit with plain-language explanation
- E9 Outdoor unit receives no signal from indoor unit. with plain-language explanation
- EE Combination error between FTC and outdoor unit source text only
- J0 Communication failure between FTC and wireless receiver with plain-language explanation
- J1–J8 Communication failure between wireless receiver and wireless remote controller with plain-language explanation
- J9 Communication failure between FTC (Main) and FTC (Sub). source text only
- L3 Circulation water temperature overheat protection with plain-language explanation
- L4 DHW tank water temperature overheat protection with plain-language explanation
- L5 Indoor unit temperature thermistor (THW1, THW2, THW5A, THW5B, THW6, THW7, THW8, THW9) failure with plain-language explanation
- L6 Circulation water freeze protection with plain-language explanation
- L8 Heating operation error with plain-language explanation
- L9 Low primary circuit flow rate detected by flow sensor or flow switch (flow switches 1, 2, 3) with plain-language explanation
- LA Pressure sensor failure source text only
- LB High pressure protection with plain-language explanation
- LC Boiler circulation water temperature overheat protection with plain-language explanation
- LD Thermistor (Boiler flow water temp.) (THWB1) failure source text only
- LE Boiler operation error source text only
- LF Flow sensor failure source text only
- LH Boiler circulation water freeze protection source text only
- LJ DHW operation error (type of external plate HEX) with plain-language explanation
- LL Setting errors of DIP switches on FTC control board with plain-language explanation
- LP Out of water flow rate range for outdoor heat pump unit with plain-language explanation
- P1 Thermistor (Room temp.) (TH1) failure with plain-language explanation
- P2 Thermistor (Ref. liquid temp.) (TH2) failure with plain-language explanation
- P6 Anti-freeze protection of plate heat exchanger with plain-language explanation