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The fault points to the indoor coil sensor and usually requires inspection, cleaning, or replacement of the component.
The P4 fault usually indicates a communication or power failure in the outdoor unit, with risks if the unit is forced to operate.
The E3 warning is usually related to the indoor fan or the T2 sensor. That is how it is interpreted and checked logically.
The Ed warning usually indicates a communication failure between the units and requires checking the wiring, circuit boards, and power supply.
The unit goes into protection due to lack of refrigerant. These are the signs, the real cause, and the correct repair.
Fault F91 points to the refrigeration circuit and requires checking pressure, leaks, and key components quickly.
The fault between units usually comes from wiring, boards, or unstable voltage; it is advisable to check the source methodically.
The H19 fault indicates a problem with the indoor fan. Causes, symptoms, and a safe check before repair.
The boiler is protected by an excessive temperature rise: key to understanding the lockout and its real cause.
The boiler locks out after starting due to a flame that does not stabilize. These are the causes and the safe check.
A temperature lockout can take the boiler out of service. These are the causes and the safest response.
The EA warning usually indicates that the boiler is not confirming the flame. These are the causes and the most useful checks.