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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
48
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 105
z
Pull out the plug of the safety sensor.
box 106
z
Set multimeter to “measure resistance”.
z
Measure the resistance of the safety sensor.
box 107
z
Pull out the plug of the flow NTC sensor.
box 108
z
Set multimeter to “measure resistance”.
z
Measure the resistance of the flow NTC sensor.
box 109
z
Measure the electrical resistance of the flow NTC sensor
and safety sensor.
z
Measure the electrical resistance of the flow NTC sensor
and check the earth (ground) connection of the safety
sensor. This must be infinitely high.
The measured resistance of the flow NTC sensor is
virtually identical to that of the safety sensor.
