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