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8 guides
Parts and tools for AC / heat pump error codes
These are the parts, tools and supplies that the manufacturer manuals behind our AC / heat pump code pages name. Each guide explains what the item does, how to choose and test it and when to leave it to a technician. Shopping links are Amazon links; search links open results and never confirm a fit for your model.
By brand
Bryant AC / heat pumpCarrier AC / heat pumpDaikin AC / heat pumpFujitsu AC / heat pumpGoodman AC / heat pumpMitsubishi AC / heat pump
Guides
Run capacitor (furnace blower and AC)
What a run capacitor does, which furnace and AC codes mention it, the testing method in the Goodman service manual and its discharge warning.
Thermostat
How a thermostat fits into furnace and AC codes, how to check compatibility, and where your manual covers the wiring.
Furnace and AC air filter
How a dirty filter triggers furnace and AC codes, how often to change it, how to read the size and what the MERV rating means.
Furnace filter sizes: how to read and match yours
How to read the nominal size on a furnace filter, why actual size is smaller, and links for common 1-inch sizes.
AC and heat pump coil cleaning supplies
Why Carrier and Goodman AC codes tell you to check the coils for debris or ice, and the soft-touch supplies for gentle cleaning.
Multimeter for appliance and HVAC diagnosis
What a multimeter measures, which manual steps call for one, how to choose one and the rules for using it safely.
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Non-contact voltage tester
How a non-contact voltage tester works, how to choose a dual-range model and why it never replaces switching power off.
Nut driver set
Why nut drivers suit appliance and furnace panels, which sizes a common set covers and what insulated means.
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