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Correction
A
Remove front cover panel
Check boiler temperature sensor
40
20
10
8
6
4
2
1
0.8
0.6
0.4
0.2
50
86
122 158 194 230
68
104 140 176 212 248
70
10
30
50
80
20
40
60
Boiler water temperature in ºF/ºC
1. Remove the screw at the top of the
boiler.
2. Press down the springs on the
underside of the boiler.
3. Remove the front cover panel.
4. Lift the front cover panel from the
wall mounting frame.
1. Disconnect cables from boiler
temperature sensor A.
2. Measure resistance of the boiler
temperature sensor and compare
with resistance/boiler water
temperature curve shown on the
left.
3. If the value measured differs
significantly, replace the sensor.
WARNING
The boiler temperature sensor is
immersed in the heating water (risk
of scalding).
Drain the boiler before replacing the
sensor.
90
110
100 120
Troubleshooting
65
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