Flue Gas Probe; Cleaning The Flue Gas Probe; Cleaning The Flue Gas Probe With Gas Path Closed; Changing A Defective Thermocouple - TESTO 300 XXL Instruction Manual

Maintenance

Flue gas probe

Cleaning the flue gas probe

If the flue gas is heavily laden with dust, it is possible that
sections of the gas path preceding the hose filter will
become contaminated or blocked.

Cleaning the flue gas probe with gas path closed

Pull off the probe shaft, place and move about in hot water.
Then blow out with air or clean with a round brush (e.g.
brass).

Changing a defective thermocouple

Pull the bend protection spring of the rear outlet from the
guide by twisting to the left and remove the left hose. Pull
out the thermocouple by the cable.
Remove the thermocouple only if defective.
Remove the bend protection spring and remove the cable
from the slotted hose.
When inserting a new thermocouple, do not crush the
thermocouple cable; push in fully using a small screwdriver.
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