Water Heating Systems
Electric Tankless Models Service Bulletins
Tronic 5000C/6000C – WH17 Model Only
Heating Canister Replacement Directions
Tronic 5000C/6000C – WH27 Model Only
Heating Canister Replacement Directions
AE115, AE125, RP17PT, and RP27PT (prior to FD108)
EP-25 Comprehensive Troubleshooting Guide
RP17PT and RP27PT
EP-01 Light Off - Water Not Hot
EP-02 Neon Light On - Water Not Hot
EP-22 Replacing Control Board
EP-23 Removing & Replacing Element Assembly
EP-24 Removing & Replacing Flow Transducer
RP17PT and RP27PT (Polymer Models Only)
EP-03 Freeze Prevention
RP Series
EP-01 Freeze Prevention
E1-11 Warm Inlet Water Modification
E1-02 Overcoming Fluctuating Temperatures
E1-21 Replacing Flow Switch
E1-22 Replacing Circuit Board
12 kW Troubleshooting Guide
Tronic US 3, 6, 7, 9 & 12
Low kW Troubleshooting Guide
TRONIC 5000C Pro Models: WH17, WH27, WH36
Triac Printed Circuit Board Replacement
TRONIC 5000C Pro Models: WH17, WH27, WH36 (serial numbers ≥FD108)
Heating Element Replacement
TRONIC WH17, WH27, WH36, AE115, AE125
Flow Sensor Replacement
TRONIC WH17, WH27, WH36, AE115, AE125 (FD108 & Higher)
High kW Troubleshooting Guide
Electric Mini-Tank Models Service Bulletins
GL2.5Ti, GL4.0Ti, GL8Ti
P1-01 Resetting Thermostat & Setting Temp
P1-21 Replacing Element Gasket or Anode
P1-22 Replacing Thermostat
All Models
Anode Rod Inspection
Water Quality Requirements
Gas Therm Models Service Bulletins
C1210ES, C1210ESC
Replacing the Control Unit
C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES, 2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
A2 Error Code Troubleshooting
C6-C7 Error Code Troubleshooting
Replacing Primary Fan and Main Burner
E2 Error Code Troubleshooting
C1210ESC/ES, C1050ES, 940ES/ESO, 830ES
A3-E3 Error Code Troubleshooting
A4-E4 Error Code Troubleshooting
3rd Party Domestic Hot Water Recirculation Systems
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 & freeze prevention
Measuring and adjusting CO2
Replacing the Copper Heat Exchanger
Removing & replacing the water valve
Direct Hot Water Recirculation
Display blank, fuse troubleshooting
C1210ESC/ES, C1050ES, C950ES, 940ES/ESO, T9800/T9900 SE(C)
Water Valve Reset
C1210ESC/ES, C1050ES
Reducing backdraft on condensing appliances
C1210ESC/ES
Replacing & servicing the condensing heat exchanger
C1050ES, C950ES, 940ES, 940ESO, 830ES
Replacing the control unit
C950ES, C1050ES
Replacing & servicing the condensing heat exchanger
520HN
Cleaning & replacing hydro generator
Replacing the control box
Replacing the electro valves
520HN, 520PN, 330PN
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 electromagnet
Descaling the heat exchanger
Replacing ECO/Temperature Limiter
Checking the draft
Gas Tankless Models Service Bulletins
GWHC800ES / GWHC920ES / GWHC920ESC / Integra 500
Reducing Backdraft on Condensing Appliances
2400ES / 2700ES / 715ES / C800ES / C920ES / C920ESC / Integra 500 & Evolution 500
A4-E4 Error Code Troubleshooting
715ES / C800ES / 2400ES / 2700ES / Evolution 500 & Integra 500
Replacing the Control Unit
715ES / C800ES / C920ESC / 2400ES / 2700ES / Evolution & Integra 500
EA Error Code Troubleshooting
2400ES / 2700ES / 715ES / Evolution 500
A3-E3 Error Code Troubleshooting
GWH715ES / GWH2400ES / GWH2700ES / Evolution 500
Reducing Backdraft on Non-Condensing Appliances
250SX / 250SXO / 2400E / 2400EO / GWH-635-ES / GWH-635-ESO
Temperature Fluctuation Troubleshooting
A2 Error Code Troubleshooting
A7 Error Code Troubleshooting
A9 Error Code Troubleshooting
EA Error Code Troubleshooting
EC Error Code Troubleshooting
E9 Error Code Troubleshooting
Checking Gas Pressure
Measuring and Adjusting CO2
Condensation and Rain Prevention Requirements
Replacing and Cleaning the Electrodes
Gas Conversion
Descaling the Heat Exchanger
Manual Supplement - Twin Pipe Requirements for Freezing Climates
Testing and Replacing Temperature Sensors
Aquastar 125B / 125BL / 125BS