109
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in kΩ
2.
Check the sensor resistance and
compare it with the curve.
3.
Replace the sensor in the case of
severe deviation.
Checking the temperature limiter
If the burner control unit cannot be reset after a fault shutdown, although the boiler
water temperature is below approx. 85 °C, check the following:
47
1.
Pull the leads from temperature lim-
iter
fJ
.
2.
Check the continuity of the tempera-
ture limiter with a multimeter.
3.
Remove the faulty temperature lim-
iter.
4.
Coat the replacement temperature
limiter with heat conducting paste
and install it.
5.
After commissioning, press reset but-
ton
R
on the control unit.
Troubleshooting
Repairs
(cont.)
5692 860 GB
Summary of Contents for CU3A
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