Myson
Marathon 500B
Regular
15kW
1980-1995
ErP D
6 fault codes
<p>The Marathon 500B is a combi boiler from Myson, available at 15kW output. Produced 1980-1995.</p>
Marathon 500B Fault Codes 6
Code
Description
Severity
Type
FLUE SPILLAGE
Flue Spillage Detector Tripped
The flue spillage detector has activated, indicating combustion gases may be escaping into the room. This…
High
Engineer
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LOW PRESSURE
Low System Pressure
System pressure has dropped below minimum on sealed system models.
Low
DIY
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NO IGNITION
Main Burner Not Lighting
The pilot is lit but the main burner does not fire when there is a heat…
High
Engineer
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OVERHEAT
High Temperature Lockout
The boiler exceeded its safe operating temperature and the overheat thermostat has tripped.
High
Engineer
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PILOT OUT
Pilot Light Failure
The pilot light has gone out or will not stay lit. On Marathon models this is…
High
Engineer
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PUMP FAULT
Pump Not Running
The circulation pump is not running. On Marathon models the pump is internal.
High
Engineer
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