Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
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Check method<br />
Error<br />
Cause<br />
Check method<br />
Remote controller /<br />
PCB error<br />
Malfunction of<br />
water adjustment<br />
valve<br />
Defective water<br />
adjustment<br />
valve<br />
If an error occurs in the cascade system, disconnect communication,<br />
and check the system in the following procedure:<br />
1.<br />
2.<br />
Connect a good water adjustment valve to the PCB The valve<br />
should remain open when the water heater is not operating.<br />
If the PCB is defective, the motor keeps operating as the water<br />
adjustment valve is in OPEN or CLOSE status, or the valve repeats<br />
open/close.<br />
3. Replace the flow control valve for other symptoms.<br />
4. As a temporary measure, you can disassemble the water<br />
adjustment valve, open it manually, and separate the power cable<br />
of the water adjustment valve.<br />
<strong>Water</strong> heater<br />
works<br />
but error occurs<br />
Defective water<br />
adjustment valve<br />
sensor<br />
1. Open or short-circuit of the flow control valve sensor.<br />
2. Check the connector assembly and wiring state of the water<br />
adjustment valve feedback sensor.<br />
3. Check the water adjustment valve output value (AD) displayed<br />
on the PCB.<br />
On the display, F.15 or lower means the valve is open, and F.240 or<br />
higher means the valve is closed<br />
©<strong>Navien</strong> America Inc. 2010<br />
105<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0
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