The system is installed in automatic mode and operates in "test mode" but will not operate out of "test mode".
Outside temperature is 35-40 degrees and the resistance of the
temp. sensor at the humidistadt measures ~27 k Ohm (corresponds to the suggested impedance for this temp.). The humidifier is
installed in the supply plenum and the humidistadt is
located about 5 feet (farther form furnace) away from the humidifier.
On a side note, I used the manual mode resistor with similar results.
Well I fixed my problem. It was my fault. I was using installation instructions that I printed from the web, they were for a model 600. The model 600A has a different control and wiring. The model 600 required only one 24V power supply to the R & C terminals. I ran the furnace accesssory power (110v) to the supplied transformer and then to the R & C as required by the model 600. But on the 600A this must be run to the W/G & Cf pair and a seperate continuously powered 24V must be connected to the R&C pair. I bought another transformer, wired everything using the correct diagram and it works great. BTW the E3 code indicates an open circuit on the temperature sensor. Maybe you clipped the wire while stapling it to the joists. Good luck.
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Sorry to read about your problem, I hope this helps you out. did you hit the reset
Digital Humidifier Control (Model 700): (Automatic or Manual mode) Check system operation and reset Change Water Panel indicator by setting the knob to "Test/Reset". With HVAC blower operating and HVAC calling for heat, humidifier will operate for one minute. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.
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It appears your Aprilaire model 700 is wired to only operate when your HVAC fan is operated by your thermostat. Your HVAC installer can wire the humidifier control to operate the humidifier during a heat call, fan call or to turn on the fan when there is a need for humidification. Please contact your HVAC installer to have them change the wiring.
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Based on the information that I have found changing the humidifier from a manual setting to an automatic setting is somewhat easy. It will require you to remove the little blue resistor that is located at the humidistat on the two screws labeled odt and replace that with an outdoor temperature sensor part 8052 that needs to be ran to the outside of the home. Depending on your technical abilities you may be able to perform this procedure, but may need to get a contactor involved.
you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%
The outdoor thermostat senses the the temp of the outside air, and adjust the boiler water temp according to what it knows is best. The reason that the boiler is running longer is the old boiler used to be constantly sending 180ish degree water to the baseboard, now that water may only be 140ish degrees. The idea behind this is to reduce off cycle heat loss, as the greater the temp difference between the air temp and water temp, the quicker you loss heat. The theory in boiler run time is this, the less times it starts and stops, and the long run times will give you the best efficiency. Hope this answers you questions.
When your unit is on normal the outside unit works and the inside only the fan runs. your heat pump does not remove any humidity when it operates so the installation cotractor did not wire it to operate then. you can change the wiring on the humidifier to operate all the time by wiring it to the fan (g) terminal then it should work just turn it all the way to the lowest humidity when you are in cooling mode.
I have the same type of Aprilaire humidifier unit with automatic temperature sensing control. My unit also displayed the 'E3' code. The HVAC technician was on site today and replaced the temperature sensing unit that is located outside the house. The humidifier is functioning normally once again.
I had this problem several years ago. In order for the water to flow, the outside temperature sending unit must indicate to the controller that it is less than 60F. If not, the unit will not operate outside of test mode. Check the temp outside where your sending unit is (could the sun be heating that side of the house?) and ensure that the circuit to the sending unit is working. I had a bad wire splice inside a wire nut stopping the circuit. Took me a long while to figure it out.
If the outside temp and your sending unit circuit is ok, I wish you luck on your troubleshooting.