SVC 820-Tankless Gas Trouble Shooting Manual Page |
61
61
31 – Error Code Diagnostic Chart
NO
NO
Check the resistance across 2 white wires
on bottom Molex:
7K – 23K Ohms
Clean scale build-up on Inlet Thermistor.
Retest Thermistor.
IF tests OK, the water heater appears to be
normal. Attempt to operate unit again.
IF resistance NOT OK:
Replace Inlet Thermistor
Replace wiring harness for Connector “R”
on Control Board
YES
YES
Is the resistance
to the Inlet
Thermistor OK?
Is the continuity
across all wires
OK?
Remove Molex from connector “R” at Control Board.
Check continuity from black #3 wire at Molex
connector “R” and black wires at White Molex located
behind Control Board. Check continuity from white
#6 wire at Molex connector “R” and white wire at
White Molex located behind Control Board
Attempt to operate unit again.
If the unit malfunctions due to an Error Code 31:
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 ...