Weil-McLain ECO Tec Virtual Input Active — Modbus is Activating a Virtual Tt Input
Virtual Input Active
Modbus is activating a virtual TT input. This warning occurs if Modbus is activating any virtual TT input, and it clears when no virtual inputs are active. The table classifies it as No virtual inputs are active..
Applies to
This communication or network fault code is displayed by the ECO Tec control (display messages) on ECO Tec Series 2 models (80–199 heating-only and 110–199 combi), as documented in ECO Tec Series 2 Boiler Manual, doc 550-100-270/0924 (550-100-270/0924). Codes can differ between controller generations, so always check the manual that matches your unit.
- Weil-McLain ECO Tec
- Weil-McLain ECO Tec 80-H
- Weil-McLain ECO Tec 110-H
- Weil-McLain ECO Tec 150-H
- Weil-McLain ECO Tec 199-H
- Weil-McLain ECO Tec 110-C
- Weil-McLain ECO Tec 150-C
- Weil-McLain ECO Tec 199-C
Controller: ECO Tec control (display messages). Source manual: 550-100-270/0924 (2024-09).
Why a code is not a diagnosis
A communication code involves the link between controls (cascade, remote, sensors on a bus). Another unit being off, a wiring fault or an address conflict can all produce it.
Safe things to observe
- Check that every appliance in a multi-unit plant has power.
- Report the code together with any other codes on the system.
Do not
- Do not re-address or rewire control networks yourself.
How professional service helps
- A technician verifies power, wiring and settings across the connected units.
- Combustion and safety devices are verified with an analyser and the manufacturer's procedure after any repair.
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Frequently asked questions
Can I clear this code myself?
Clearing a code without fixing its cause usually just brings it back. Note the code, check the safe items on this page, then call a licensed technician. If your appliance manual describes a user reset for this exact code and it stays away, no call may be needed.
Boiler locked out? Call with the alert text ready.
The brand, model and this alert are passed along when you request service online, so the technician arrives prepared.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- ECO Tec Series 2 Boiler Manual, doc 550-100-270/0924 · 550-100-270/0924 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.