Site map
Everything published, laid out in one page. The machine-readable version is at /sitemap.xml, and the crawler rules are in /robots.txt.
Code references
- Gree E6 error code: indoor-outdoor communication faultE6
- Gree H5 error code: intelligent power module protectionH5
- Daikin U4 error code: indoor-outdoor transmission errorU4
- Daikin A5 error code: freeze-up or heating peak-cut controlA5
- LG CH05 error code: indoor-outdoor communication errorCH05
- Midea E1 error code: Aurora Xtreme communication faultE1
- MRCOOL EL01 or E1 error code: communication malfunctionEL01 / E1
- MRCOOL P1 or PC-01 error code: voltage protectionP1 / PC-01
- MRCOOL P0 or PC00 error code: inverter module protectionP0 / PC00
- Pioneer E1, EL01, or EL 01: Quantum communication errorE1 / EL01 / EL 01
- Pioneer E1 error code: room-temperature sensor failureE1
- Senville EH 02 error code: zero-crossing signal faultEH 02
- Senville PC 0A error code: condenser high-temperature protectionPC 0A
Troubleshooting guides
- Mini-split not cooling: a safe diagnostic pathnot cooling
- Mini-split not heating: what to check before servicenot heating
- Mini-split leaking water: shut down, inspect, and escalate safelywater leak
- Mini-split remote not working: batteries, signal, and controlsremote not working
- Mini-split not turning on: power, timer, delay, or faultnot turning on
- Mini-split frozen coil: airflow, thawing, and service limitsfrozen indoor coil
- Heat-pump outdoor unit iced over: defrost or a real fault?outdoor unit iced over
- Mini-split outdoor unit not running: delay, demand, or faultoutdoor unit not running
- Mini-split making noise: normal sounds versus warning signsabnormal noise
- Mini-split smells musty: filter care and deeper cleaningmusty odor
- Mini-split short cycling: settings, airflow, and service cluesshort cycling
- How to clean a mini-split filter without damaging itfilter maintenance
Brand hubs
Categories
- Ductless mini-splits
Wall-mounted, floor, and cassette indoor units paired with an outdoor condenser, with no duct network between them.
- Heat pumps
Air-source and hybrid systems that move heat in both directions, covering cooling in summer and heating in winter.
- Multi-zone systems
One outdoor unit serving several indoor heads, where a fault in one zone can present across the whole system.
- Ducted and central air
Central split systems with an air handler or furnace coil distributing conditioned air through ductwork.
- Controls and thermostats
Wall controllers, handheld remotes, smart thermostats, and the wiring that carries their signals.
- Air handlers and coils
Indoor blower assemblies, evaporator coils, drain pans, and the condensate path that leaves the building.
- Furnaces
Gas and electric heating appliances that supply warm air to a duct system.
- Boilers and hydronics
Wet heating systems that circulate hot water through radiators, cylinders, or underfloor loops.
- Indoor air quality
Filtration, ventilation, humidifiers, and dehumidifiers that condition air rather than temperature alone.
- Light commercial
Rooftop units, VRF and VRV systems, and cassette installations serving offices, retail, and small industrial spaces.