Service Bulletins

Gas Therm Models
C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES, 2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES, 2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES, 2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES, 2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
C1210ESC/ES, C1050ES, C950ES, 940ES/ESO, T9800/T9900 SE(C)
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
C1210ESC/ES, C1050ES
C1210ESC/ES
C1050ES, C950ES, 940ES, 940ESO, 830ES
C950ES, C1050ES
520HN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN, 520PN, 330PN
520HN
Bulletin Name
A2 Error Code Troubleshooting (pdf)
C6-C7 Error Code Troubleshooting
Replacing Primary Fan and Main Burner
A3-E3 Error code troubleshooting
A4-E4 Error code troubleshooting
3rd Party Domestic Hot Water Recirculation Systems
E2 Error Code Troubleshooting
Water Valve Reset
Checking & replacing temperature sensors
Replacing the gas valve
Cleaning & replacing ignition group
E1 Error code troubleshooting
EA Error code troubleshooting
Control board diagnostics
Installing AQ3ES wall thimble to uneven masonry surfaces
Checking & replacing temperature sensors
Descaling the heat exchanger
Measuring gas pressure
E9 Error code troubleshooting
EC Error code troubleshooting
Winterizing and freeze prevention
Measuring and adjusting CO2
Replacing the Copper Heat Exchanger
Removing & replacing the water valve
Direct Hot Water Recirculation
Display blank, fuse troubleshooting
Reducing backdraft on condensing appliances
Replacing & servicing the condensing heat exchanger
Replacing the control unit
Replacing & servicing the condensing heat exchanger
Cleaning & replacing hydro generator
Cleaning & replacing the pilot assembly
Checking gas pressure
Negative air & freeze prevention
No spark with hot water flow
Pilot flame, no burner flame troubleshooting
Winterizing and freeze prevention
Lowering temperature
Removing and cleaning the burners
Cleaning the inlet filter
Replacing the control box
Replacing the electromagnet
Descaling the heat exchanger
Replacing ECO/Temperature Limiter
Checking the draft
Replacing the electro valves
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