Navien NP-180, Service Manual

Page: 151 / 179

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8.2.12. Water Adjustment Valve
1. Turn off the gas supply.
2. Turn off the 120V power supply.
3. Turn off the water supply. Drain all water
from the appliance.
4. Loosen the PCB 2 screw from bottom base.
5. Pull out the PCB. (refer to 8.2.1 PCB)
6. Remove the 2 stainless clips. (fastener “D”)
9. Pull out the water adjustment valve.
10. Replace with new water adjustment valve.
11. Replace the water adjustment valve into
the cold water inlet adapter.
12. Replace the water adjustment outlet pipe
into the water adjustment valve.
13. Replace the 2 stainless clips.
14. Replace the PCB.
16. Install front panel using 4(four) screws.
17. Turn on water supply, power supply, and
gas supply.
18. Open a hot water tap and ensure there are
no leaks at the water heater.
7. Remove the water adjustment outlet pipe
from the water adjustment valve.
8. Remove the water adjustment valve from
the cold water inlet adapter.
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