Buderus 800 - 5.3.9 Checking and replacing sensors

Servicing5
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
52
 Connect system to mains power supply.
 Open maintenance isolating valves.
5.3.9 Checking the flow, return, safety and mains-water
sensors
 Unplug cable connection from sensor.
 Measure resistance of sensor.
 Use a second-reading thermometer to measure the
temperature around the sensor.
 Check readings against values shown in table 10
(see page 53). If there is any mismatch, the sensor is
defective.
 If the sensor is working correctly, plug it in once
more.
fig. 63 Cable modulating pump
1
NOTE
Fill the 800 Series and purge the system of
air.
fig. 64 Checking the flow/return sensors
fig. 65 Checking the safety sensors