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 111 page image

1095.28.2. Hot waterError type Cause Check methodCold waterfrom hotwater pipeLow hotwatertemperatureImproperplumbingAbnormalflow sensorAbnormal3-way valveDefectivespace heatingsupplythermistorDefectiveDHW heatexchangerHot watersetting errorHigh waterpressureDefective flowsensorWater mixedwith coldwaterCheck thepipeNo hot waterfrom thefaucetCirculationerror due toforeign substanceHot water pipe and direct water pipe are inverted.Abnormal rotating flow sensorDisassembly-cleaning is possible as a temporary measure. Thepriority should be given to replacement of the part.Switching from heating to hot water fails.If the hot water temperature does not rise while the boiler isrunning, check the heating outlet pipe.Check the power supply to the 3-way valve (Blue + Black AC120V) 120V)Replace the PCB if power is not supplied.Current thermistor sensing error.If no hot water is acquired while the remote controller is in the hotwater mode, and displays high hot water temperature, it is due tothe defective space heating supply thermistor.Replace the thermistor.The hot water temperature is low while the boiler burns andoperates normally.Direct water is mixed with hot water due to defective internal shapeof hot water inlet/outlet of the DHW heat exchanger.Replace the DHW heat exchanger.Check the hot water temperature setting on the remote controller.Water pressure is too high for the boiler capacity.Install a reducing valve, and adjust water pressure with an interme-diate valve.Refer to the hot water supply capacity on the rating plate.EX) CH-210 / Water Temperature+77ı=4.5GPMIn the speed hot water function, the boiler operates with thepre-heating function. It is impossible to switch the hot water modefrom the room controller, but the pre-heat lamp flickers only.Lukewarm water is acquired.Replace the flow sensor.An error in internal circulation of the boiler due to debris caused byaging of pipe.Check if the space heating strainer is clogged.Check if the DHW heat exchanger is clogged with debris.To check if the DHW heat exchanger is clogged, touch both sidesof the DHW heat exchanger, and check if there is substantialdifference of temperature.The temperature of hot water at the tap is low while the tempera-ture is high at the hot water outlet.The hot water pipe is installed such that hot water is mixed withcold water.Cold water and hot water are mixed due to improper installation of the tap.The boiler cold water valve is closed.Check if the cold water filter is clogged with debris.Check if the cold water / hot water pipes are frozen during the winter.©Navien America Inc. 2010 CH series service Manual Version 1.0