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Troubleshooting
TRoUblesHooTInG
Problem
Humidifier will not
operate
Proper voltage present at
solenoid valve (24 VAC)
but no water flow
Humidifier runs without
air handler operation or
humidifier never shuts off
Too much humidity
in home and/or
condensation on windows
No humidifier operation in
"ON" position
Humidifier operation in
"ON" position only
Humidifier operation
continuous
Humidifier turns on and
off repeatedly
Where can I purchase
replacement parts?
Revised 07-12
Checks and Corrections
1. Set thermostat to operate air handler in heating mode. Operation may be
necessary for system power.
2. Humidity level in home may be higher than humidistat setting. Increase
humidity setting on humidistat.
3. Verify water supply is on.
4. Check for voltage at the solenoid valve. Voltage should be 24VAC. Bypass the
humidistat if necessary to isolate the solenoid valve circuit.
5. Verify wiring of humidifier and humidistat.
1. Verify water supply is on.
2. Verify metering orifice is not obstructed. Very hard water with high mineral
content may restrict the metering orifice in as little as one heating season.
Replace metering orifice if restricted.
Verify humidifier and humidistat wiring. Humidifier should operate with air handler
in heating mode.
Reduce the setting on the humidistat. Refer to CARE AND MAINTENANCE section
of this manual to estimate a humidity setting for the home based on outside
temperature.
1. Set thermostat to operate air handler in heating mode. Operation may be
necessary for system power.
2. Check voltage at humidifier control terminals. Voltage should be 20-30 VAC.
3. Inspect humidifier wiring. Refer to wiring diagrams.
do noT leave In "on" PosITIon, as oveR HUMIdIfICaTIon MaY oCCUR.
1. Humidity level in the home is higher than knob setting. Humidifier control will
not operate the humidifier until humidity level is reduced.
1. When the humidity in the home is less than the knob setting, the control will
operate humidifier until the humidity is higher. Reduce knob setting.
2. Use "ON" position. Verify that the humidifier operates.
3. Remove wires from control terminals. If humidifier continues to operate, check
solenoid valve.
1. Check voltage at humidifier control terminals. Voltage should be 20-30 VAC.
2. If mounted on return air duct, make sure humidifier control is at least 24"
upstream of humidifiers air discharge.
Replacement parts can purchased through your authorized Bosch Distributor or
visit www.bosch-climate.us or more information.
Subject to change without prior notice
IaQ series 13
6 720 220 343
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