Navien CH-180 Service manual - page 74

72

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 20k ohm at normal condition.

Caution : Before measuring resistance of the thermistor,

   remove the connector from the PCB.

©Navien America Inc. 2010

CH  series service Manual

Version 1.0