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No heat — what's the equipment?

Same symptom, completely different parts. A furnace that won't light, a heat pump stuck in defrost and a boiler that won't fire share nothing but the cold house — so tell us what you have and we'll rank the likely parts from real repairs on that equipment.

What's not heating?

• 🔥 Furnace →

• ♻ Heat pump ○ We're still gathering enough heat pump repairs to rank parts honestly.

• ♨ Boiler ○ Boilers land with the hydronics catalog in a later phase.