Assessments - 2, GPA: 3.5
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• Measure resistance of valve coil. 52 Modulating Solenoid Valve Signal Abnormal • Ensure fan will turn freely. • Check wiring harness to motor for damaged and/or loose connections. • Measure resistance of motor winding. 61 Combustion Fan Failure If blank screen is present on remote control then the flow control has shorted out. Unplug flow control. If remote lights up and unit starts operating then replace flow control assembly. 65 Water Flow Servo Faulty (does not stop flow properly) • Check wiring harness to all solenoids for damage and/or loose connections. • Measure resistance of each solenoid valve coil. 71 SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault • Ensure flame rod is touching flame when unit fires. • Check all wiring to flame rod for damage. • Remove flame rod and check for carbon build-up; clean with sand paper. • Check inside burner chamber for any foreign material blocking flame at flame rod. • Measure micro amp output of sensor circuit with flame present. • Replace flame rod. 72 Flame Sensing Device Fault • Flush heat exchanger. Refer to instructions in manual. • Replace heat exchanger. Scale Build-up in Heat Exchanger (when checking maintenance code history “00” is substituted for “LC”) LC • Clean inlet water supply filter. • On new installations ensure hot and cold water lines are not reversed. • Check for bleed over. Isolate unit from building by turning off hot water line to building. Isolate the circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your plumbing. • Ensure you have at least the minimum flow rate required to fire unit. • Ensure turbine spins freely. • Measure the resistance of the water flow control sensor. • Remote control does not light up but you have 12 VDC at the terminals for controls. No Code (Nothing happens when water flow is activated.) 12 Wiring Diagram Water Inlet Max. Gas Inlet Min./Max Forced Low Table 1 Forced High NAT.G 5"W.C. /10.5"W.C. 8"W.C. /13.5"W.C. LPG NAT.G LPG NAT.G LPG 150 PSI 0.56"W.C. 0.88"W.C. 505 305 U287-1185 (02) COLOR CODING W :White BK:Black BR:Brown R :Red BL:Blue Y :Yellow P :Pink O :Orange G :Green GY:Gray 1 3 BR 3 1 B 1 2 OFF Dip SW1 3 8 7 6 5 4 F5 WW B1 BK BK MIN MAX MODULATING VALVE CURRENT ADJUSTING F4 Gas pressure WW W P W W OUTGOING WATER THERMISTOR HEAT EXCHANGER THERMISTOR Y BR O R W WY ORBR WRBK for 2-Unit Connection (Optional) 1 13 WATER FLOW SENSOR BK F2 Y R RY BK QS BY-PASS FLOW CONTROL DEVICE RBK Y FREEZE PROTECTION OPTION G W W W O F3 WW O P BL R BR Y GY WATER FLOW CONTROL DEVICE R BL BR Y GY GR AIR TEMPERATURE THERMISTOR R BL BR Y INDOOR MODEL ONLY COMBUSTION FAN FM R BK Y E W 1 W 4 1 Y BK R BY-PASS SERVO MODEL ONLY 1 1 THERMAL FUSES R R OVERHEAT SWITCH H2 H1 MODULATING SOLENOID VALVE POV H3 P P H4 FLAME ROD Y H5 SV1 H7 H6 SV0 BL SV2 BK BK P Y BK MAIN SOLENOID VALVE SOLENOID VALVE 1 SOLENOID VALVE 2 F6 BR Y P BK BL P (CN2) P Y R 12 1 SOLENOID VALVE 3 H8 BR SV3 BK GY C1 GY IG GY IGNITER GND GY SURGE PROTECTOR 3 1 BR BL G/Y D2 W BK 1 3 GND FUSE (3A) W BK W BLBL D4 ANTI-FROST HEATER AC120V HOT NEUTRAL GROUND G/Y D1 GND D5 ANTI-FROST HEATER BL BL D3 FROST SENSING SWITCH W BL REMOTE CONTROLLER SPARK ELECTRODE 5 4 Spare Parts Only Gas type 123 OFF Dip SW2 6 A C D E F G H F1 G1 (CN3) (CN4) (CN1) (CN12) (CN5) (CN7) (CN9) 5 3 RR F7 (W) (W) 505 305 505 305 3.3"W.C. 5.1"W.C. 2.9"W.C. 4.2"W.C. Models 305 and 505 have a default maximum temperature of 120°F (49°C) and an option to increase the maximum temperature to 140°F (60°C). Temperature settings from 125-140°F (52-60°C) are available by setting dip switch 6 to ON in the SW1 bank of 8 dip switches. Outdoor WARNING DO NOT adjust the other dip switches unless specifically instructed to do so. Incorrect Dip Switch Settings can cause the water heater to operate in an unsafe condition and may damage the water heater and void the warranty. Troubleshooting Outgoing Water Thermistor: White - White N / A See example above F5 3 - 4 Heat Exchanger Temperature Thermistor: Pink - White N / A See example above F4 3 - 11 Intake Air Thermistor (Indoor model ONLY) Orange - White N / A See example above F3 3 - 12 Surge Protector: Black - White 108 ~ 132 VAC N / A D2 1 - 3 Blue - Brown 108 ~ 132 VAC N / A D1 1 - 3 Remote Controls: Terminals B1 10 ~ 13 VDC 1.5 ~ 3.0 K ohms B 1 - 3 (SV1, SV2, SV3 and POV) Gas valve and Modulating solenoids: (Set meter above 2K) (Main) Pink - Black Wire color Voltage Resistance Connector # Pin #'s 11 ~ 13 VDC 36.8 ~ 44.8 ohms H5 6 - 7 (SV1) Black - Yellow 11 ~ 13 VDC 36.8 ~ 44.8 ohms H6 5 - 6 (SV2) Black - Blue 11 ~ 13 VDC 36.8 ~ 44.8 ohms H7 4 - 6 (M) Water Flow Control Device Servo or Geared Motor: NOTE: The grey wire listed above turns to black at F connector on the PCB. Set your meter to the hertz scale. Reading across the white and black wires at terminals 2 and 4 you should read between 60 and 420 hertz. Grey - Brown 4 ~ 6 VDC N / A F7 5 - 7 Red - Blue 11 ~ 13 VDC 22 ~ 28 ohms F7 9 - 10 (QS) Water Flow Sensor...
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