Navien CH-180, Service Manual, Page: 38 / 155

36
4.6.4. High Limit Switch or Exhaust Limit Switch
Navien Part No.
Function
Check Point
BH1401022A
BH1401027A
B
Failure Event
Effects
Error Code
E016, E030
Diagnostic
Color /
Number of wires
1. Overheating preventing switch.
2. Due to the high temperature, it will automatically trip and automatically
reset.
3. Detects excessively high water temperature
(more than 197.6
ı
) in heat exchanger. (BH1401022A)
4. Detects excessively high flue gas temperature
(more than 149
ı
) in exhaust duct. (BH1401027A)
1. Unable to detect excessively high water temperature if switch fails.
2. Unable to detect excessively high flue gas temperature if switch fails.
1. Visual inspection: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
1. Yellow – Yellow : DC 4 ~ 6 V
2. Red – Red : DC 4 ~ 6 V
1. Unable to shut down the boiler if the water temperature from the heat
exchanger exceeds 197.6
ı (92 ç ).
2. Unable to shut down the boiler if the flue gas temperature from the
exaust duct exceeds 149
ı (65 ç ).
G
ڪڡڡڃڪګڠکڄ
ڪکڃڞڧڪڮڠڄ
ڃڜېۏۊۈڼۏۄھٻڭۀۏېۍۉڄ
ڃڑڐ൥ڏ୅ڄ
ڡۇېۀٻڢڼێ
ڃڜېۏۊۈڼۏۄھٻڭۀۏېۍۉڄ
ڃڔڍ൥ڏ୅ڄ
ڲڼۏۀۍ
ڌڏڔ൥ڎڔډڍඑ
ڌڒڔډڑ൥ڎڔډڍඑ
ڌڋڏ൥ڎڔډڍඑڃڏڋ൥ڏ୅ڄ
ڌڒڋډڑ൥ڎڔډڍඑڃڒڒ൥ڏ୅ڄ
© Navien America I nc. 2010 CH series service Manual Version 1.0