Question about Bosch ProTankless GWH 715 ES LP Tankless Water Heater, Propane
Before calling service technician, open following link for Bosch troubleshooting resources:
Error codes are starting point for troubleshooting, and solutions vary by model and unit.
E4 is Backflow temperature sensor over 309 degrees F. Appliance will close burner and lock.
Check combustion air and backflow vent piping for blockage.
Check if secondary fan connections are disconnected.
Check venting specifications are met. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
Check sensor resistance
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Posted on May 29, 2011
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Posted on Jan 02, 2017
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