Check the boiler temperature sensor, cylinder temperature
sensor or the flow temperature sensor for low loss header
1. B oiler temperature se nsor: Pull the
leads from boiler temperature
sensor A and measure the resis-
tance.
Cylinder temperature sensor: Pull
the plug % fr om the cable harnes s
on the control un it and measure the
resistance.
Flow temperatu re sensor: Pull
plug X3 from the control unit and
measure t he r esistance ac ross
terminals X3.4 a nd X 3.5.
Repairs (cont.)
87
Troubleshooting
5692 537 GB
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