88 NPE Service Manual
5.1.4 016Error
Error occurrence conditions and check items
Error Description
E16
Bimetal overheated
If the overheat controller on the heat exchanger is initiated during combustion/standby of the water heater, the
system displays the 016E (manually cleared) message on the front panel. The water heater switches into Lock-
Out, and performs post-purge continuously and operates the pump.
Check items
1. Check if the overheat controller is working properly.
* Check resistance value or continuity. (refer to page 59)
2. Check the hot water temperature sensor. (refer to page 60)
Measuring should be done at least 30minutes
after error.
Check connector
(#1 and #2 of CON 6)
Replace HTL
1 step: Flushing, Clean Filter
2 step: Try to restart
Check the resistance between #1 and #2 of
CON 6: short-circuit
NO
Yes
Is HTL* normally
operating?
Is HTL* normally
operating?
* HTL: High Temperature Limit Switch
Yes
NO
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