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Navien NHB error 038E — no hot water

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Journeyman exam — gas pipe sizing formula

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DeltaVince_PDX

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Photo ThreadVERIFIED ✓
Close-up of properly sweated copper pipe joint showing clean solder work

Textbook 1/2" copper sweat — no cold lap, full penetration

by MasterKyle_ATX · Journeyman

14 comments2h ago
App Launch — Feb 2026
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From a fixture swap question to a commercial boiler emergency — the community already solves problems on real jobsites every day.

Exam Prep
Marcus Delgado, plumbing apprentice studying for journeyman exam
Studying for my journeyman exam on lunch breaks. Someone already posted every gas pipe sizing problem from the last three exams with full worked solutions. Passed first attempt.
Marcus Delgado·2nd Year Apprentice·Houston, TX
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Brenda Kowalczyk, one-truck plumbing shop owner in Cleveland
Tankless error code at 4 PM Friday, customer waiting. Pulled up Flux, found a thread with the exact Noritz E9 fix — condensate trap clogged. Ten minutes, job done. Saved my weekend.
Brenda Kowalczyk·Owner, Kowalczyk Plumbing·Cleveland, OH
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Terrence Okafor, mechanical contractor who saved a school boiler contract
Commercial boiler on a school job, 6 AM Monday, principal standing there. Weil-McLain throwing a 4-flash lockout nobody on my crew recognized. Posted on Flux, had a retired union man with 30 years on Weil-McLain respond in four minutes. He sketched the fix on the back of an invoice — I wish I could say that literally, but he sent a photo of actual handwriting. We had heat by 7:15. I would have lost that contract.
Terrence Okafor·Mechanical Contractor·Columbus, OH
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