Check the boiler temperature sensor, cylinder temperature
sensor or the flow temperature sensor for low loss header
1. Boiler t emperature sensor: Pull the
leads from boiler temperature
sensor A and measure the resis-
tance.
Cylinder temperature sensor: Pull
the plug % from th e cable harness
on the control uni t and measure the
resistance.
Flow temperature s ensor: Pull plug
X3 from the control unit and mea-
sure the resistance across term-
inals X3.4 and X3.5.
Repairs (cont.)
85
Troubleshooting
5692 548 GB
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