Navien CH-180, Service Manual, Page: 88 / 155

86
Error conditions and Symptoms Analysis
5.15. 15Error
Check method
Error Description
If an error occurs in the internal circuit of the PCB (e.g., resistance, transistor or
relay fault), the system displays 15E PCB error message.
15E
PCB error
Check
items
1. Defective PCB
2. Check, with a tester, if the PCB is in the rated voltage (AC 97V~138V).
3. Disconnect the grounding wire, and check the PCB.
Fault
Possible
Causes
Check method
Replace the PCB if there is an error in the PCB internal circuit.
Check, with a tester, if the PCB is in the rated voltage.
Check, with a tester, if the voltage at the receptacle is
97V~138V.
Power supply grounding noise causes malfunction.
Disconnect ground by applying a tape on the grounding
terminal in the receptacle, and check if the PCB works normally.
15E
PCB error
Defective
PCB
Power supply
error
Power supply
grounding
noise
Replace the main
PCB
After press reset button to normal?
No
Yes
Normal state
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