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Page SVC 820 Tankless Gas Trouble Shooting Manual
24
1L - Warning Code
Explanation:
The Control Board has detected possible lime build-up inside the heat exchanger. To prevent permanent damage
to the unit, the unit must be drained and flushed. Flushing procedures may need to be repeated for excessive lime and scale
build-up. To reset 1L Code, hold down the MIN and MAX buttons at the same time for 10 seconds.
Lime and scale flushing procedure for tankless water heaters:
In areas with hard water conditions the tankless water
heater can develop lime and scale deposits in the heat
exchanger. These deposits can restrict the water flow and
degrade the performance of your water heater. These
instructions are to provide a safe and effective means to
remove lime and scale build up in the heat exchanger of
your tankless water heater. If you are not comfortable with
this procedure, then seek the assistance of a plumbing
professional.
Flushing Procedure with Isolation Valves:
If your
tankless water heater is not installed with isolation valves,
it is recommended that you seek the assistance of a
plumbing professional.
1.
Turn off the electricity and gas, to the tankless
water heater. Do not perform this procedure with
power or gas turned on; damage to the water
heater can occur.
2.
Shut off the main water supply valve to the
tankless water heater. Consult the instructions
provided by the isolation valve manufacturer for
specifics in using their valve assemblies.
3.
Attach a small garden hose on each drain valve.
Connect the cold water hose to the output of a
small circulation pump. A pond pump or similar
model can be used for this application.
4.
Pour approximately five gallons of
virgin food
grade white vinegar
into a pail.
5.
Place the inlet hose of the pump and the drain
hose from the hot water heater into the pail.
6.
Open the drain valves and turn on the pump.
Allow solution to circulate for approximately 45
minutes to an hour.
7.
Turn off the pump and drain the vinegar from
water heater. Close the cold water drain valve.
8.
Open the main cold water supply valve and allow
fresh water to flush through the water heater for
at least 5 minutes to remove all traces of vinegar
from the system.
9.
Close the cold water main valve and remove
water filter screen located in cold water inlet of
water heater. Clean the screen of any sediment or
dirt and reinstall the filter. See the Use and Care
Manual provided with your tankless water heater
for detailed instructions.
10.
Turn on the water shutoff valves, run a hot water
tap to purge any air from the water lines and
check the system for any leaks.
11.
Turn on gas, electricity, and remote control
thermostat and set the desired temperature.
12.
Run hot water from several locations to check the
operation and performance of the water heater.
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 ...
