NTI Trinity TRX 4 13 — Room Sensor Circuit Open or Short Circuit Zone 3
4 13
Room sensor circuit open or short circuit zone 3. The room sensor circuit for zone 3 is open or short circuited; causes include no room sensor being present, damaged BUS wiring, zone control wiring problems, or a damaged PCB. The table classifies it as Blocking (AUTO Reset).
Applies to
This sensor fault code is displayed by the TRX Series I control on TRX Series I models up to 150C (TRX085, TRX110C, TRX120, TRX150C), as documented in TRX 085–150C Installation and Operation Manual, doc 420010970805 Rev 01.24.23, Part 13-B Boiler Error Codes (420010970805 Rev 01). Codes can differ between controller generations, so always check the manual that matches your unit.
- NTI Boilers Trinity TRX
- NTI Trinity TRX085
- NTI Trinity TRX120
- NTI Trinity TRX150
- NTI Trinity TRX199
- NTI Trinity TRX110C
- NTI Trinity TRX150C
- NTI Trinity TRX199C
Controller: TRX Series I control. Source manual: 420010970805 Rev 01 (2023-01-24).
Why a code is not a diagnosis
A sensor code usually means the sensor, its wiring or its mounting is faulty; the physical condition the sensor measures (temperature, pressure, flow) may be perfectly normal.
Safe things to observe
- Note the code; there is no homeowner-accessible check for sensor circuits.
- If the appliance still runs, watch whether the code returns and report it when you call.
Do not
- Do not open the appliance to test or replace sensors yourself.
How professional service helps
- A technician measures the sensor and harness against the manual's values and replaces the faulty component.
- 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.
Parts and service
Parts commonly involved
These parts appear in the documented text for this alert. A code reports a condition, not a failed part — a technician confirms the cause by testing before anything is replaced.
Boiler sensors (thermistors)
Boiler sensors are small temperature probes, usually thermistors, that tell the control how hot the water and flue gases are so it can fire safely…
What a technician checks →Control board / PCB
The control board — also called the PCB, or printed circuit board — is the boiler's main computer.
What a technician checks →Zone control panel and relays
A zone control panel is the switching brain of a multi-zone hydronic system: it reads each thermostat, opens the right zone valves or starts the…
What a technician checks →
Service for this alert
- Gas Boiler Repair
Licensed gas technicians from ROMA Heating & Cooling diagnose and repair residential and light-commercial gas boilers across…
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for NTI Boilers Trinity TRX.
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
- TRX 085–150C Installation and Operation Manual, doc 420010970805 Rev 01.24.23, Part 13-B Boiler Error Codes · 420010970805 Rev 01 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.