Viessmann VITOLIGNO 300-P Service Instructions Manual page 101

Repairs
(cont.)
Lambda probe
For measuring the residual oxygen con-
tent in the flue gas.
Checking the Lambda probe
1. Check the Lambda probe for contam-
ination and/or damage (see
page 49).
2. Check the connecting cable for dam-
age.
Notes
■ Do not paint, wax or treat the probe
with any other substance. Only use
special grease suitable for Lambda
probes to grease the threads.
■ The Lambda probe receives its refer-
ence air via the connecting cable. For
this reason, ensure that the connec-
tion plugs are kept clean and dry and
do not treat them with contact spray,
anti-corrosion agents etc.
■ Do not solder the connecting cable; it
may only be crimped, clamped or
secured with screws.
Connection
Connect the Lambda probe at plug a:K
(see chapter "Connection and wiring dia-
gram" from page 133).
Troubleshooting
101