Heating, cooling and hot water problems, fixed

Furnaces, boilers, air conditioners, heat pumps, mini splits, electric heaters, thermostats and water heaters. Every guide takes one fault and checks the parts in the order a technician checks them.

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A water heater, a gas furnace, a mini split, an outdoor air conditioner and two thermostats

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Air conditioning Not cooling, freezing up, leaking water, capacitors and drain lines. Boilers No heat, pressure, lockouts and resets on hot water, steam and combi boilers. Electric heat Electric baseboard, wall and space heaters: no heat, shutting off, tripped breakers, overheat resets, cleaning and Furnaces Cold air, short cycling, flame sensors, pilot lights and blink codes. Heat pumps No heat, frozen outdoor unit, fan not turning, defrost problems. Mini splits Blinking lights, error codes, not cooling or not heating. Thermostats Blank screens, wiring, Honeywell, Nest and ecobee faults. Water heaters Leaks, no hot water, pilot lights, noise and error codes on tank and tankless heaters.

Newest guides

Furnaces

Honeywell S8610U Error Codes: Green LED Flash Codes

The Honeywell S8610U shows its error codes as flashes of a green status LED. 2 flashes is a

Water heaters

American Standard Water Heater Codes: Flashes and Numbers

American Standard water heater error codes depend on the heater. The gas Power Vent flashes a light on

Boilers

Lochinvar Noble Error Codes: Lockouts and Fault Messages

Lochinvar Noble error codes are words on the SMART SYSTEM display, such as Flame Fail: Ignition, Air Pressure

Thermostats

Sinope Thermostat Error Codes: E1, OL, HH, LL and GFCI

On Sinope's baseboard and floor thermostats, 22 of the 31 error codes include one step, after any check

Electric heat

Honeywell Heater Error Codes: E1, Beeps and Shut Offs

On a Honeywell space heater, E1 is about the tip-over switch. The HZ-960, HZ-970 and HZ-980 manual says

Electric heat

Pelonis Heater Error Codes: E1, E2, E3, FF and P4

On Pelonis digital space heaters, E1 or E2 means the temperature sensor has a short or open circuit.

More fixes

Thermostats Mysa Thermostat Error Codes: H1, H2, H3, H4 and H5 Mysa thermostat error codes start with H, and on the Mysa for Baseboards the meaning depends on the model. On the V1

Boilers Weil-McLain ECO Tec Error Codes: Blower Fault and Lockouts A Weil-McLain ECO Tec Series 2 names its faults on the touchscreen instead of using numbers. In a lockout the banner turns

Boilers Weil-McLain Evergreen Error Codes and Lockout Messages A Weil-McLain Evergreen Pro shows its faults as words, not numbers: the display turns red and names the fault, such as IGNITION

Water heaters Bradford White AeroTherm Error Codes: F11, F20 and 94 Bradford White AeroTherm heat pump water heaters show two kinds of code. The AeroTherm Series (RE2H...-1NCTT) shows F codes: F11 is a

Boilers Weil-McLain AquaBalance Error Codes: A01, F37 and A16 The Weil-McLain AquaBalance shows A or F with a number. A codes are hard lockouts: press RESET for 1 second once the

Water heaters Bradford White Tankless Error Codes: Infiniti 10, 11, 45 Bradford White's Infiniti GS and GR tankless heaters flash Er and a number on the display. Its manuals list 10 as the

Electric heat Dreo Heater Error Codes: E1, E2, FF, F2, P4 and PP Dreo heaters show a code on the LED display, and Dreo's own product pages explain them. FF or F2 is overheat protection:

Boilers Bradford White Boiler Error Codes: Brute FT 10, 11 and 80 The Brute FT boiler shows Er: and a number on its display. Bradford White lists 10 as the flame going out eight