HTP Versa-Hydro E07 — CH Sensor Failure (hydronic Heating Module)
E07
CH sensor failure (hydronic heating module). One or both of the clip-on temperature sensors in the hydronic heating module is disconnected. The tank portion can still operate but the hydronic heating module will not until the error clears. Go to the STATUS menu screen showing CH Supply to determine which sensor has the error (reasonable reading = return sensor on the horizontal pipe; unreasonable = supply sensor on the vertical pipe); check the thermistor connections on the outlet manifold and the wiring harness; replace the thermistor if necessary; replace the control if both are connected properly. The table classifies it as Error (Auto Reset).
Applies to
This sensor fault code is displayed by the 926 SIT control on Versa-Hydro models (PHE130/PHE199), as documented in Versa-Hydro Installation Manual, LP-314 Rev. 012 Rel. 007 (12.8.21), Table 21 (LP-314). Codes can differ between controller generations, so always check the manual that matches your unit.
- HTP Versa-Hydro & Versa-Hydro-Solar (discontinued)
- HTP PHE130-55
- HTP PHE130-80
- HTP PHE130-119
- HTP PHE199-55
- HTP PHE199-80
- HTP PHE199-119
- HTP PHE130-80S
- HTP PHE130-119S
- HTP PHE199-80S
- HTP PHE199-119S
Controller: 926 SIT control. Source manual: LP-314.
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.
Thermistor / NTC sensor
A thermistor is the small temperature probe — technically a negative temperature coefficient, or NTC, resistor — that tells a boiler's control how…
What a technician checks →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 →
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 HTP Versa-Hydro & Versa-Hydro-Solar (discontinued).
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
- Versa-Hydro Installation Manual, LP-314 Rev. 012 Rel. 007 (12.8.21), Table 21 · LP-314 · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.