515Error - Navien NCB-150E Service Manual

5.2.20 515Error

Error occurrence conditions and check items
Error
E515 error
Check items
Check the sub code
number of E515
Number 1,2 or 10
1. Check the wire connection
between gas controller and
Main PCB.
2. Check the coil of solenoid valve.
(Refer to page 71)
1. Turn off and on the Power
RESET switch.
2. In that same case, replace the
Main PCB.
Check method
Fault
PCB or Electrical supply
126 NCB-E Service Manual
If an error occurs in the internal circuit of the PCB (e.g., resistance, transistor or relay fault), the
system displays 515E (cleared manually) on the PCB.
1. Defective PCB
2. Check with a multimeter if the PCB is supplied with the proper voltage (AC 102-132 V).
3. Check the wire connection.
4. Disconnect the ground wire, then check the PCB
Number 3 or 4
Check the Fan voltage.
Possible Causes
Defective PCB Replace the PCB if there is an error with the PCB internal circuit.
Check with a multi-meter if the PCB is supplied with the proper voltage.
Power supply error
Check with a multi-meter if the voltage at the electrical outlet is AC 102-132 V.
●
Power supply grounding noise causes malfunction.
Power supply grounding
Disconnect ground from the grounding terminal inside the unit, and check if the
●
noise
PCB is operating normally.
Description
Number 9
1. Check the wire connection
between dual venturi and Main
controller.
2. Check the dual venturi.
Check method
Number 11 or 12
Version 1.4