KDB-GOM
Series
- 71 -
12
# 16
Failure
Mechanical overheat
No
Symptoms and Causes
Solutions
Reference
When the high limit sensor (98
℃
) located
on the upper right pipe of the main heat
exchanger starts operation.
1
The heating valve is shut down and the
temperature abruptly goes up.
- Open the splitter valve if it is closed.
<Fig. 1>
2
The hot water sensor in ON and the 3-
way valve shuts off the heating side.
- Separate the hot water flow switch jack and if
the 3-way valve goes back to its initial position,
the hot water flow switch is defective and has
to be replaced.
<Fig. 2>
3
The high limit sensor is defective and
failure code # 16 is displayed when the
boiler does not operate.
- Replace the high limit sensor.
- If the symptoms remain after checking the
above, replace the main controller.
<Fig. 3>
Terminal separation
<Fig. 1>
<Fig. 2>
<Fig. 3>
Splitter Valve
Hot Water Flow Switch
High Limit Sensor