My daughter in Portland OR rents a home. the landlord replaced the furnace 4 months ago.
When it operates, there are ticking noises and when looking into the air intake, you can see blue sparking. It has been going on for months. The furnace seems to operate normally; heats, blows air etc.
The installer told them to clean filter which they did, replaced with new filter. But that seems like BS.
What is this and is it dangerous? Any thoughts helpful.
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