36Error - Navien NP-180 Service Manual

5.20. 36Error

Error occurrence conditions and check items.
Error
If a master/slave communication error occurs under the cascade system, the system
displays the 36E (cleared automatically) error message.
1. All other water heaters except the water heaters where the communication error
36E
has occurred operate normally. (The water heaters with the communication error
Communication
maintain the Cascade ON mode, and operate normally when the flowmeter works.)
Error
2. If a communication error occurs in the master water heater, all the slave water
heaters operate individually.
1. Check the communication cable.
2. Check the external power supply (187~254V).
Check items
3. Check the communication switch on the PCB.
4. Check if the PCB works normally.
Check method
Error
Defective power
Communication
Defective
error
communication
Other trouble Setting error
Defective
Other trouble
©Navien America Inc. 2010
Description
Cause
Check the power supply to the water heater.
supply
Check the connection of the communication cable,
and if the cable is disconnected.
cable
In the Cascade system, the controller communication switch
(DIP S/W No. 6) must be set to ON for the first and the last systems,
and OFF for the remaining systems.
< Communication switch (DIP S/W No. 6)>
If the trouble continues despite the checking of above items,
the PCB is defective.
PCB
109
NR/NP series service Manual
Check method
Version 2.0