Verified boiler fault code
Main Heating E50 Fault Code (Eco Elite System)
Hot-water NTC fault.
Safety disclaimer
Fault code summary
- Manufacturer
- Main Heating
- Fault code
- E50
- Fault type
- Temperature sensor, Hot water
- Severity
- Not specified
- Reset
- Not specified
- Applicable models
- Main Eco Elite 24 System ErP, Main Eco Elite 28 System ErP
Quick answer
Hot-water NTC fault.
What does this fault code mean?
Hot-water NTC fault.
Common causes
- Hot-water NTC fault.
Symptoms
- The facia displays E50.
What can the homeowner safely check?
- Record the displayed code and consult the user instructions.
Boiler reset information
Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- Investigate the hot-water NTC sensor and wiring.
Applicable boiler models
Related fault codes
- E110 — Eco Elite System
Safety thermostat operated.
Read fault code - E119 — Eco Elite System
Water-pressure switch not operated; the manual states this is shown below 0.5 bar primary-water pressure.
Read fault code - E125 — Eco Elite System
Circulation fault in the primary circuit.
Read fault code - E131 — Eco Elite System
Interruption of power supply while in fault mode.
Read fault code - E133 — Eco Elite System
Interruption of gas supply or flame failure.
Read fault code - E160 — Eco Elite System
Fan or fan-wiring fault.
Read fault code - E20 — Eco Elite System
Central-heating NTC fault.
Read fault code - E28 — Eco Elite System
Incorrect PCB fitted.
Read fault code
Manufacturer documentation
Main Eco Elite System Installation & Service ManualTable Of Error Codes: E50 — Hot Water NTC Fault.
Last verified
2026-09-12
Frequently asked questions
What does Main Heating E50 mean?
Hot-water NTC fault.