Fault Codes - Mark GNSD Technisches Handbuch
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C/D One or two maximum temperature thermostats, order code 31 01 935
The maximum temperature thermostat switches the burner off when the value set is reached.
The fans continue to operate and the burner becomes operational (reciprocating motion) again
after cooling to below the value set. One or two thermostats may be installed depending on the
type of appliance. See the value-setting table for details [9].
5.4 Air pressure switch, order code 06 07 604 [10]
The differential pressure switch checks the transport of the combustion gases. If no or insufficient
combustion-gas transport is detected, the feed to the gas control combination is interrupted.
Setting: adjusted at the factory.
D
Adjustment disc
E
Low pressure connection
F
High pressure connection
5.5 Flue gas fan [11]
Depends on the appliance type.
5.6 Fan [12]
For axial fan: depends on the appliance type. [12]
For centrifugal fan: depends on the customer's project requirements, consult your dealer.
6.0 Fault codes
Code
Error
01
Ignition failure
02
Gas valve relay/T max.
03
Gas valve
22
Air compression switch
23
Filters/system fan
24
Air compression switch
25
T max.
31
Too many attempts to restart
65
Phase and zero back to front
73
Ambient temperature sensor
76
System sensor
81
Ambient temperature sensor
84
System sensor
If a different failure code appears on the room thermostat display, please contact the device
supplier.
10
Description
Ignition has failed (three attempts at ignition).
Maximum thermostat is open
Gas valve faulty / Wire connecting the gas valve to
the burner control box is open-circuit or has been
incorrectly connected.
The air compression switch is not open
Filter is dirty/system fan has suffered a thermal failure
The air compression switch is not off
Maximum thermostat is open
Flame goes out (3x) when the device is in operation.
Phase and zero not connected correctly
Ambient temperature sensor interrupted
System temperature sensor interrupted
Ambient temperature sensor has short circuited
System temperature sensor has short circuited
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