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the BT1256502 fan relay is a frequent failure point due to pitted contacts or a failed coil
Precise 210°F Setpoint: Fixed temperature calibration prevents drifting
technicians can maintain optimal burner efficiency and safe combustion performance during system commissioning or routine troubleshooting
obstructed ductwork
technicians must verify the integrity of the combustion blower orifice
Johnson Controls T-4000-3139 Plastic Cover the BT1256502 fan relay isThe Johnson Controls T 4000 3139 is a professional grade horizontal pneumatic thermostat cover designed specifically for the T 4000 Series room thermostats. Engineered for demanding commercial environments, this white plastic cover provides a clean, uniform look for horizontal mounted controllers where a blank faceplate cover is required. As a genuine Johnson Controls replacement part, it ensures a precise fit for single or dual element sensing units
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