SVC 820-Tankless Gas Trouble Shooting Manual Page |
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41
CONTROL BOARD Diagnostic Chart
NO
NO
NO
NO
NO
YES
Measure DC voltage across black wire #6
and yellow wire #1 on connector “K”:
90 – 120 DC Volts
Is the voltage
OK?
Measure DC voltage across black wire #6
and red wire #5 on connector “K”:
90 – 120 DC Volts
Measure DC voltage across black wire #6
and blue wire #4 on connector “K”:
90 – 120 DC Volts
Measure DC voltage across black wire #6
and white wire #2 on connector “K”:
90 – 120 DC Volts
Measure DC voltage across black wire #6
and grey wire #3 on connector “K”:
90 – 120 DC Volts
Is the voltage
OK?
YES
YES
Is the voltage
OK?
YES
Is the voltage
OK?
YES
Is the voltage
OK?
Control Board is ‘OK’
IF all components tested ‘OK’:
**CHECK GAS, VENTING, & GROUND**
All voltage checks must be performed while unit is attempting to go to main burner and Molex connector “K” IS
connected to Control Board. Restart unit after each voltage check.
Replace Control Board
Replace PCB
Replace Control Board
Replace Control Board
Replace Control Board
Summary of Contents for PH2-20R DVSN
Page 158: ... 158 Schematic Disassembly PH2 20RDVS PH2 25RDVS PH2 28RDVS ...
Page 159: ... 159 Schematic Disassembly PH2 20RDVS PH2 25RDVS PH2 28RDVS ...
Page 160: ... 160 Schematic Disassembly PH2 20RDVS PH2 25RDVS PH2 28RDVS ...
Page 162: ... 162 Schematic Disassembly PH2 20ROF PH2 25ROF PH2 28ROF ...
Page 163: ... 163 Schematic Disassembly PH2 20ROF PH2 25ROF PH2 28ROF ...
Page 164: ... 164 Schematic Disassembly PH2 20ROF PH2 25ROF PH2 28ROF ...
Page 166: ...Schematic Disassembly PHH 32RDV PHH 25RDV 166 ...
Page 167: ...Schematic Disassembly PHH 32RDV PHH 25RDV 167 ...
Page 169: ... 169 Schematic Disassembly PHH 32ROF PHH 25ROF ...
