What is the T1 error on Felicity?

T1 on a Felicity unit means: Keine Kommunikation mit Wechselrichter.. It can appear on 1 device in the Felicity catalog. The cause and recommended fix are listed for each device on this page.

Can I clear the T1 code myself?

It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.

Is the T1 fix the same on every device?

The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.

Where does this information come from?

Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Fault

T1

Keine Kommunikation mit Wechselrichter.

1 Devices that report this code

What does the T1 error code mean?

T1 on a Felicity unit indicates: Keine Kommunikation mit Wechselrichter.. It is a fault-severity event that can appear on 1 device in the Felicity catalog. The same code may have slightly different recommended fixes depending on the device — the per-device sections below show the exact wording from each device's official manual.

This is a fault-severity code

Fault codes stop normal operation but the unit may attempt to recover. Common causes are out-of-range conditions (voltage, current, temperature) that require checking inputs and outputs before restart.

What triggers this code

T1 is triggered when the unit's protection or monitoring logic detects the specific condition described above. The exact trigger depends on the device — see the per-device sections for the official manual entry for each.

FLS48100SG2Battery↗ view on device

T1Keine Kommunikation mit Wechselrichter.Fault

Description

Unable to communicate with the inverter. Maintenance troubleshooting item (no LCD code).

Cause

The wrong communication cable was used, or the battery DIP-switch settings are incorrect (Falsches Kommunikationskabel verwendet oder DIP-Schalter falsch eingestellt).

Recommended fix

Before connecting the battery to the inverter, set the battery DIP switches correctly according to the DIP-switch table. After setting the DIP switches, restart the battery to activate the DIP, then use the correct communication cable to connect the battery and the inverter.

Source:Benutzerhandbuch - Felicity FLS48100SG2.pdf · page 27

Frequently asked about T1

What is the T1 error on Felicity?: T1 on a Felicity unit means: Keine Kommunikation mit Wechselrichter.. It can appear on 1 device in the Felicity catalog. The cause and recommended fix are listed for each device on this page.
Can I clear the T1 code myself?: It depends on the severity. Warning-level codes can usually be cleared by following the recommended fix. Fault and critical codes often require checking the source condition first; if the code returns immediately after restart, escalate to authorized service.
Is the T1 fix the same on every device?: The cause is consistent — it's the same protection logic. The exact fix wording can differ per device because each official manual addresses model-specific context (input ranges, parallel-config notes, firmware revisions). Use the per-device section that matches your unit.
Where does this information come from?: Every entry is sourced directly from the official Felicity user manual for the affected device. The "Source" line at the bottom of each device's section shows the manual filename and page number.

Compiled from official Felicity user manuals. Always consult your device manual and a qualified technician before performing repairs.