Viessmann Vitoladens 300-W Service Instructions For Contractors page 71

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit

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Table of Contents

Repairs

(cont.)

Checking the boiler water temperature sensor, the cylinder tem-

perature sensor or the flow temperature sensor for the low loss

header

1. ■ Boiler water temperature sensor:

■ Cylinder temperature sensor: Pull

■ Flow temperature sensor: Pull plug

Troubleshooting

Pull the leads from boiler water

temperature sensor A and check

the resistance.

plug % from the cable harness at

the control unit and check the

resistance.

"X3" from the control unit and

check the resistance across termi-

nals "X3.4" and "X3.5".

Table of Contents

Vp3b