Navien CH-180, Service Manual, Page: 74 / 155

7 2
Error conditions and Symptoms Analysis
5.7. 06Error
Check method
Error Description
Check the supply temperature sensor. If a problem (short-circuit: 248
ı
or higher) is
detected for 3 seconds, the system displays the error message 06E on the indoor
thermostat.
06E
Shortcircuit
of heating
temperature
sensor
Check
items
1. Check if the supply temperature sensor connector is wet due to any reason,
including leakage.
2. Replace the defective supply temperature sensor.
3. Replace the PCB.
Fault
Possible
Causes
Check method Remark
Check if the hot water temperature sensor connector or the PCB
harness terminal is wet due to any reason, including leakage.
Check the current heating temperature on the display.
0Ω
Shortcircuit
Sensor
error
Defective
temperature
sensor
connector
Temperture
sensor
Defective
PCB
Other
trouble
If the trouble continues despite the checking of above items,
replace the PCB.
Measure the temperature sensor resistance, if the value is 0Ω,
replace the temperature sensor
Is the hot water thermistor
normal ?
Yes
No
Check connector
Replace hot water thermistor
Resistance between two red whires of CN 13 is from
0.8 to 20 k ohm at normal condition.
Caution : Before measuring resistance of the thermistor,
remove the connector from the PCB.
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0