Robertshaw 780-790 HSI Module 30067439-890 the regulator must be vented

the regulator must be vented to the outside per local mechanical codes

this is a specialized inducer cooling fan used specifically to dissipate heat from the motor itself

Is this spring compatible with the standard 243-8 or 243-12 models

frequent error codes related to sensor limit faults

Robertshaw 780-790 HSI Module 30067439-890 the regulator must be ventedFor field techs dealing with intermittent ignition failures or flame sensing issues on gas fired heating systems, the Robertshaw 780 790 HSI Module provides a reliable, direct replacement solution. This hot surface ignition control is engineered to drop into tight control cabinets, serving as the primary replacement for the HS780 17NL 304A as well as the 104A and 108A variants. Operating on a standard 120V AC ignition system, the module features a