RE: Apartment A-115 – Unresolved On-Demand Hot Water Heater (ODHWH) Failure To Monarch Management, This letter serves as formal notice regarding a hazardous maintenance condition in Apartment A-115 that has remained unaddressed for three years. During a routine air filter change for the HVAC system on 2/20/26, I accessed the diagnostic interface of the Navien On-Demand Hot Water Heater. I have captured the internal error log in the attached photograph (See Exhibit A) for legal and maintenance reference. Evidence of System Failure (Reference: Exhibit A) As shown in the attached image, the unit is currently reporting a recurring history of the following critical codes: Error 003 (Ignition Failure): Indicates a failure to light correctly, leading to potential gas accumulation and "hard start" combustion risks. Error 060 (Dual Venturi/Fan Speed Error): Indicates a malfunction in the air-to-gas mixing and exhaust ventilation system. Safety & Liability Warning These ...