Navien CH-180 Service Manual

Also see for CH-180: Owner's operation manual User's operation manual Installation manual Operation manual Installation manual

Contents

Navien CH-180 Service Manual Manual pdf 89 page image

87Error occurrence conditions and check items5.16. 16ErrorError DescriptionIf the high limit switch cutoff on the heat exchanger is sensed to be 197ı or highercontinuously for 1 second at combustion/stop of the boiler, the system displays the16E (manually cancelled) heat exchanger high limit switch cut-off message on theremote controller. The boiler switches into Lock-Out, and performs post-purgecontinuously.1. Check the heating supply/return valve.2. Check if the heating strainer is clogged.3. Check the circulation pump operating status.4. Check if the high limit switch is defective.5. Check if the thermal fuse is disconnected.6. Check the heating supply temperature sensor.7. Check if the heat exchanger or the DHW heat exchanger is clogged.8. Check if the heat exchanger is defective.16EHigh LimitSwitchCut-offCheckitemsIs HTL * normally operating?YesNo Replace HTLCheck the resistance between two white wires of CN 13: short-circuit (016E)Check the resistance between two brown wires of CN 13: short-circuit (030E)Replace PCBCaution: Measuring should be done at least 30 minutes after error.*HTL: High Temperature Limiter©Navien America Inc. 2010 CH series service Manual Version 1.0