13 on an Ecoforest heat pump: Temperature reading failure in an indoor th-Tune terminal
Short answer
On an Ecoforest heat pump, 13 means: Temperature reading failure in an indoor th-Tune terminal. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 2 sources
What it means
On the ecoGEO Basic & Compact (R410A inverter GSHP)
The manual says: Temperature reading failure in an indoor th-Tune terminal.
When it shows: Monitored parameter outside normal range: Temperature reading failure in an indoor th-Tune terminal.
On the ecoGEO HP (high power)
The manual says: Failed temperature reading by th-Tune indoor terminal.
When it shows: Monitored parameter outside normal range: Failed temperature reading by th-Tune indoor terminal.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
Manual reset: User ALARM menu: Alarm reset -> Yes (2013 manual p60).
What you can check
- Read and note the alarm number/message shown on the heat pump front panel (Alarm button lights red).
- Check the heat pump supply breaker at the consumer unit is on.
- Reset active alarms via the user ALARM menu (Alarm reset -> Yes) as the user manual allows; if the alarm returns, call the installer/service centre.
- Check the th-Tune room terminal display is powered and showing readings.
What the engineer will check
- Check th-Tune temperature sensor.
- Consult Ecoforest technical service documentation (restricted portal).
Who to ask for: heat pump / heating engineer.
What you might notice
Sources
- ecoGEO B1/B2/B3 & C1/C2/C3 3-12 / 5-22 kW Installation and User Manual V03.B03_EN (23/09/2015) ↗ · V03.B03_EN · page 79 · Reviewed 23 September 2026
- ecoGEO HP Installation and Operating Manual Version 1.00 (08/05/2014) ↗ · 1.00 · page 54 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026