Johnson & Starley
QuanTec 28C
Combi Boiler
28kW
2012-2018
ErP A
36 fault codes
<p>The QuanTec 28C is a combi boiler from Johnson & Starley, available at 28kW output. Produced 2012-2018.</p>
QuanTec 28C Fault Codes 36
Code
Description
Severity
Type
1
Ignition Failure (Numeric Display)
On Johnson & Starley models with numeric displays, code 1 indicates flame lockout after several ignition…
Medium
DIY
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3
Overheat (Numeric Display)
On Johnson & Starley models with numeric displays, code 3 indicates the high water temperature limit…
High
Engineer
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37
Low Water Pressure (Numeric Display)
On Johnson & Starley numeric display models, code 37 indicates low system water pressure.
Low
DIY
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E01
Ignition Lockout
The most common Johnson & Starley fault. The boiler has failed to ignite after multiple attempts.…
Medium
DIY
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E02
False Flame Lockout
The boiler's ionisation circuit has detected a flame when the gas valve should be closed. Safety-critical…
High
Engineer
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E03
Overheat Lockout
The boiler has overheated and the safety thermostat has triggered a lockout.
High
Engineer
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E05
Fan Fault
The boiler fan is not operating correctly - not starting, running too slowly, or speed sensor…
High
Engineer
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E08
Flame Circuit Failure
There is a fault in the flame monitoring circuit on the Johnson & Starley boiler's control…
High
Engineer
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E09
Gas Valve Feedback Error
The gas valve is not responding correctly to control commands, or there is a feedback signal…
High
Engineer
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E12
EEPROM Lockout
There is a memory fault on the PCB. The boiler's configuration data cannot be read or…
High
Engineer
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E33
Return Thermistor Fault
The return temperature sensor has a fault - open circuit, short circuit, or wiring issue.
Medium
Engineer
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F37
Low Water Pressure
The system water pressure is too low for safe operation on Johnson & Starley boilers.
Low
DIY
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F40
Water Pressure Too High
The system water pressure is too high - above 3 bar.
Medium
Engineer
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F52
DHW Sensor Fault
The domestic hot water temperature sensor has a fault.
Medium
Engineer
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F53
Flue Temperature Sensor Lockout
The flue gas temperature sensor has triggered a lockout due to excessive flue temperatures or a…
High
Engineer
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