Bradford White BRADFORD WHITE EVERHOT TG-237I-N(X)A Service Manual

1SERVICEMANUALTankless Gas Water HeaterTroubleshooting Guideand Instruction for Service(To be performed ONLY by qualified service providers)For the Br

II - SPECIFICATIONS - GENERALSafety devices Appliance - AC 120 Volts - 60Hz. 15A - DedicatedRemote control DC 12 Volts (Digital)Flame failure - Flame

II - SPECIFICATIONS - COMBUSTIONItem Gas type Natural PropaneGas consumption Minimum Btu’s 15,000 15,000Maximum Btu’s 180,000 180,000Injector D

II - SPECIFICATIONS (cont.)DIP SWITCH SETTINGSDANGERDo not attempt to adjust dip switch settings from there factory default settings.Doing so will res

II - SPECIFICATIONS (cont.)DIP SWITCH SETTINGSCombustion Blower Dip Switch Settings for Vent Length Compensation Under 22 Feet (6.7 m):To assure optim

II - SPECIFICATIONS (cont.)VENTING TABLEVenting Table – Examples of Maximum Venting Distances with Various Elbow Combinations35 Ft. (10.7 m) 1 41 (12.

III - MAIN COMPONENTS1. Mechanical Water RegulatorThe unique water regulator mechanism ensures the hot water is maintained with no noticeablechange to

III - MAIN COMPONENTS (cont.)5. Combustion FanAir for the combustion is supplied by a centrifugal fandriven by a DC motor. After a pre-purge period of

IV - SAFETY DEVICE FUNCTIONFlame FailureSituated to the right of the burner in the front of the combustion chamber, the flame rod monitors thecombusti

IV - SAFETY DEVICE FUNCTION (cont.)Over temperature Cut-OffThe temperature of the outgoing hot water is constantly monitored by the water temperaturet

V - SEQUENCE OF OPERATIONThe preset temperature is selected at one of the remotes controls (where fitted). Where no remotecontrol is fitted , the defa

Key to Warning SymbolsFailure to comply with the following instructions may results in serious personal injury ordamage to the appliance.Be careful of

V - SEQUENCE OF OPERATION (cont.)When the hot water tap is turned off, the water flow sensor stops revolving, and the magnetic pulseceases, indicating

V - SEQUENCE OF OPERATION (cont.)Operation Sequence Flow Chart21

V - SEQUENCE OF OPERATION (cont.)Operation Sequence Flow Chart22

V - SEQUENCE OF OPERATION (cont.)Sequence Timing Chart23

V - SEQUENCE OF OPERATION (cont.)Sequence Timing Chart24

Error Faulty Remedy10 Air Supply Check all vent components for proper connections.or Exhaust Check that nothing is blocking the flue inlet or exhau

26Error Faulty Remedy32 Outgoing Water Check sensor wiring for damage.Temperature Check resistance onsensor.Sensor Faulty Check and clean dirt fro

27VI - TROUBLESHOOTING (cont.)Quick Reference Diagnostic PointsIMPORTANT SAFETY NOTES:There are a number of (live) tests that are required when fault

28VI - TROUBLESHOOTING (cont.)Thermal Fuse:Wire color Voltage Resistance Connector # Pin #’sRed ~ Red 100 VAC Below 1 ohm B ~ C B6 ~ C1Overhea

Fuses:This unit has two inline (3) amp glass fuses. Remove the fuse and check continuity through it. If youhave Continuity through the fuse, it is goo

TABLE OF CONTENTSSectionDescription Page- - - Glossary of Terms and Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . .4I. . . . . . . . .

Wiring Schematic30

31Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedureA. The LED onthe remotecontrol does notlight up, whenthe system is

32Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedure2. Measure the voltageat connector F withappliance power supplyon.

33Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedureError code "11"displayed ondigital monitor.5. Check igni

34Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedureC. Combustionoccurs, but flamefails.Error code "12"displ

35Nature of FaultExaminationPoint Diagnostic Point Values Y/N ActionServiceProcedure2. Measure voltagebetween orange (+) andgrey (-) of the water flow

VI - TROUBLESHOOTING (cont.)Troubleshooting ProcedureUnit’s wiring diagram can be found on page 29.Appliance fails to operate (even remote control fai

3) Is the remote control normal ?No combustion (despite remote control indication)1) Is the water flow sensor normal ?37Check voltage between the two

2) Is the flame rod normal ? Error “72” is displayed3) Is the water temperature thermistor normal?38Checking the flame rod.a. # Detach the flame rod

39Motor check.If error “61” is displayed, check the combustion fan.a. Measure voltage at connector A1. Black and red wires.Normal: 6 ~ 45 VDC (Fan on

GLOSSARY OF TERMS AND SYMBOLSThis glossary of terms and symbols is provided to assist you in understanding some of thelanguage used throughout this ma

40If error “11” or “71” is displayed, check the main gas solenoidvalve.a. # Disconnect the main gas solenoid valve (SV0) connector and measure the re

9) Is the change over solenoid (SV3) operating normally?41If error “11” or “71” is displayed, check the change over solenoid (SV3).a. # Disconnect th

Combustion stops due to flame failure1) Is the flame rod functioning normally?2) Is the earth lead wire connected?42a. Measure the voltage between th

Unable to adjust hot water temperature1) Is the water temperature thermistor operating normally ?2) Is the change over solenoid (SV1) normal ?43a. #

44a. # Disconnect the modulating valve festoon C2terminals and measure the resistance at the terminals.Normal: 67 ~81 ΩIf normal, check b.Faulty: Rep

Anti-frost heaters do not operate1) Are the ceramic anti-frost heaters operating normally ?2) Is the frost sensor switch operating normally ?a. # Dis

VII - GAS PRESSURE SETTING PROCEDUREAll settings/adjustments must be performedby a qualified Service Technician.1. Turn unit off at power source and

47Figure #1 Figure #2VII - GAS PRESSURE SETTING PROCEDUREWARNINGDip switched #7 and #8 (combustion control switches) MUSTbe returned to the "OFF&

VIII - Service ProcedureNOTE: Before proceeding with dismantling, be sure to follow the CAUTION instructions beforeeach explanation. Always disconnect

IMPORTANTWhen dismantling the unit you should always isolatethe following items:• Gas supply• Electrical supply• Water supply• Drain all water from th

I - GENERAL INFORMATIONThis tankless water heater is a high output, high efficiency appliance, which heats the watercontinuously as hot water is being

b. Remove the four (4) Phillips screws that securethe water inlet filter housing to the unit. Seepicture below for location of screws. Once screws ar

IGI – 7. Removal of Transformer:CAUTION120 volt potential exposure. Isolate the appliance andreconfirm power has been disconnected using a multi-meter

IGI – 9. Removal of the Gas Valve Assembly:CAUTION120 volt potential exposure. Isolate the appliance andreconfirm power has been disconnected using a

53IGI – 11. Removal of Thermal Fuse:CAUTION120 volt potential exposure. Isolate the appliance andreconfirm power has been disconnected using a multi-m

IX - FLUSHING PROCEDURE FOR LIMESCALE REMOVAL FROM HEAT EXCHANGERThe amount of calcium carbonate (lime) released from water is in direct proportion to

55X - PARTS BREAKDOWNDisassembled View - Cabinet

X - PARTS BREAKDOWNDisassembled View - Internals56

X - PARTS BREAKDOWNDisassembled View - Internals57

X - PARTS BREAKDOWNDisassembled View - Electrical58

PARTS LISTNumber Description Quantity001 Casing Assembly 1002 Wall Fitting Bracket 2003 Rubber Bushing 1004 Connection Reinforcement Panel 1005 Heat P

I - GENERAL INFORMATION (cont.)HOW TO USE THIS MANUALIt is intended for this manual to be used by qualified service personnel for the primary purpose

405 Bypass O-Ring 1406 Water Filter Assembly 1407 Filter Plug 1408 Hot Water Outlet – _" NPT 1409 Sensor Bracket 1410 Small Plug Gasket 1411 Drai

61OPTIONAL VENTING COMPONENTSNote: When ordering service replacement parts, the full model and serial numbers from the waterheater nameplate are requi

62Notes

63Notes

Sales/800-523-2931Fax/215-641-1670Technical Support/800-334-3393Fax/269-795-1089Warranty/800-531-2111Fax/269-795-1089International:Telephone/215-641-9

I - GENERAL INFORMATION (cont.)CUT-AWAY ILLUSTRATION7

I - GENERAL INFORMATION (cont.)SCHEMATIC ILLUSTRATION8

9II - SPECIFICATIONS - GENERALModel type RESIDENTIAL COMMERCIALType of appliance Temperature controlled continuousflow gas hot water systemOperatio