FLUE GAS SENSOR
Subject
Description
Part Function
It is the component protecting the boiler from overheating by
measuring flue gas temperature.
Impact in Case of Faulty
Operation
1- Where ingress or egress surface type NTC sensors
malfunction, the boiler continues to burn without giving
overheating warning and cause deformation of exchanger.
2- The boiler does not function.
Primary Relevant Error
Codes
E18, F07, F53
Troubleshooting and
Testing Method
Visual Inspection and Testing:
1- Checking whether cable connections are proper and without
damage
2- Checking whether there is any rusting, corrosion, or
deformation on the immersion probe
3- Resistance check
Maintenance Requirement
No special maintenance requirement
Maintenance Period
-
Testing Definition
Testing Method
Flue Gas Sensor
Resistance Control
Cut off the power to the boiler. Remove the flue gas temperature
sensor the boiler and keep them rest at room temperature for about 10
minutes for cooling. Measure resistance between NTC ends. Check
whether resistance value conforms to the following chart.
Ambient Temperature
(°C)
Resistance measured on Surface Type NTC ends (kohm)
0-5
30,9 - 24,5
6-10
24 - 19,5
11-15
19 - 15,7
16-20
15,2 - 12,7
21-25
12,2 - 10,3
26-30
9,8 - 8,4
31-35
8 - 6,9
36-40
6,5 - 5,7
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