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or the main burner failing to sustain a flame despite a proper call for heat from the 24V circuit
and Ducane air handlers
The WHL0491 is commonly found in Trane AUC
it meets the precise 0
ensuring long-term signal stability in high-humidity airflow environments
MARS 83905 Surge Protect 319825-402 or the main burner failingThe MARS 83905 Surge Protector is a professional grade Type 1 and Type 2 SPD specifically engineered to safeguard sensitive HVACR electronics from transient overvoltage. Utilizing advanced TPMOV (Thermally Protected Metal Oxide Varistor) technology, this device isolates fault conditions to prevent the catastrophic failures often seen with standard MOVs. Designed for 120 240V single phase systems, it offers a robust 20,000 Amp surge current capacity