Biotech PZ100RL pellet boiler troubleshooting and maintenance. The boiler hadn’t been operating for a while.
The lambda sensor had to be removed for cleaning. Unfortunately the nut was damaged and the factory recommended lambda tool could not be used. It didn’t fit on the nut. Our self developed extra short lambda tool did the job.
Damaged lambda sensor nut
Lambda sensor tools
Dust removed from lambda sensor
The lambda sensor seals were also too rigid to seal properly. As a temporary solution I put there some fire retardant silicone, but the washers will be replaced along with the nut during next maintenance.