Baxi Luna Duo-tec E83 — Ot Communication Failure
E83
OT Communication Failure. Check OT connection, remove power, reconnect OT connections, if problem persists replace service key. The table classifies it as Lockout (manual reset).
Applies to
This communication or network fault code is displayed by the Duo-tec GA control on Luna Duo-tec GA combi models (40GA, 60GA and Compact 30GA), as documented in Luna Duo-tec 40GA / 1.33GA Installation & Operation Manual (EN-FR), I&O 7703472.01 (7703472.01). Codes can differ between controller generations, so always check the manual that matches your unit.
- Baxi Baxi Luna (North America)
- Baxi Duo-tec Compact 30GA
- Baxi Luna Duo-tec 40GA
- Baxi Luna Duo-tec 60GA
- Baxi Luna Duo-tec 1.33GA
- Baxi Luna Duo-tec 1.48GA
- Baxi Luna Duo-tec 1.70MP
- Baxi Luna Duo-tec 1.110MP
Controller: Duo-tec GA control. Source manual: 7703472.01 (2018-03).
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
- Luna Duo-tec 40GA / 1.33GA Installation & Operation Manual (EN-FR), I&O 7703472.01 · 7703472.01 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.