SVC 820-Tankless Gas Trouble Shooting Manual Page |
11
11
13
Indoor ONLY
Venting:
Flame Rod FL-2: Reads
Poor Or Improper
Combustion
Ensure intake and exhaust venting meet all installation requirements (diameter; vent
lengths; venting material; venting obstructions; and all other requirements as
described in the Use & Care manual
{Make sure exhaust is not recirculating into fresh
air intake}
)
If venting requirements are met:
1.
Remove any blockage from venting or from in front of vent termination
2.
Verify altitude settings
3.
Check Flame Rod FL-2
4.
Check Blower Motor
14
Condensing only:
Maintenance:
Flue Temperature Too
High
Condensing Only:
1.
Clean blockage in heat exchanger
2.
Remove any blockage from Blower Motor and exhaust vent
Mid Efficiency &
Condensing:
Over Heat Limiter (OHL)
Fault
Mid Efficiency & Condensing:
If ‘Condensing’ maintenance requirements are met:
1.
Verify “U” connector is connected to Control Board
2.
Verify wiring harness is connected to OHL
3.
Check heat exchanger for cracks and/or separations
4.
Inspect Overheat Wrap (Overheat wrap failure: Replace unit)
5.
Check thermal overload sensor (condensing models only)
15
Maintenance:
Boiling Safety Device
(Heat Exchanger
temperature reached
207 F degrees for more
than 15 seconds)
1.
Flush Heat Exchanger (lime/scale buildup)
2.
Check for closed water heater inlet valve or restrictions in cold water inlet
pipe (must be fully open)
3.
On commercial water heater, lower set point temperature below 180
0
F at
high altitudes
If maintenance requirements are met:
1.
Check Heat Exchanger Thermistor
16
Maintenance:
Outlet Water
Temperature Is Above
Remote Thermostat
Setting
1.
Check for clogged Heat Exchanger
2.
Check for restrictions in airflow around unit and vent terminal
If maintenance requirements are met:
1.
Check Outlet Thermistor
2.
Check Heat Exchanger Thermistor
3.
Check gas valve
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 ...
