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May be an issue with the solenoid valve. check for voltage at the valve. if there are error codes check the owners manual for cause. I am providing a link to the manual if you don't already have one. the last thing to check would be the control itself. the control and the solenoid valve are the 2 main items for the unit. hope this helps.
Thank you for contacting us. Does your humidistat have a blower activation switch on the lower left hand side of the humidistat? If you do it is our #60 humidistat, and if it is not there you have a #58 humidistat. The R & C are the two connections that supply power to the humidistat to give you the numbers on the digital display. The 60 you wire right into the R & C off the furnace panel. The 58 you need a constant 24 volt and 10 VA power source which you could get by using the transformer off a constant 120 volt power source to power the humidstat. If you are doing this correctly and you still do not get the numbers to show up, then you have a bad humidistat and you need to go back to where you purchased it from and exchange it under warranty provided you used a certified HVAC contractor to do the installation. Our warranty is only valid if you used a certified HVAC contractor to do the installation. If you have any additional questions please contact us at 800-334-6011.
Kevin Engen Customer Service Research Products Corporation
I corrected the problem...RH is rising nicely!! Installed by "professionals" on my Trane XV90....I redid their wiring and now have the following setup...
600A water supply coming from hot water line. Removed orifice inside incoming feed tube. control incoming water flow from saddlevalve on hot water supply ( make sure its a nice solid flow, no drips, but no "force" too it either)..enough to insure entire evaporator unit is wet and water is slightly flowing out of bottom to drain.
I also have it wired to run when ever the furnace blower is on. Heat or no heat. XV90 is variable speed, and by doing this the 600a is always adding moisture, until it reaches correct RH%
Also, I disconnected the outdoor temp sensor. I went to Radio Shack and bought a 47K ohm resistor ( 1/2 watt....4 pack for 99 cents). Installed that in place of outdoor sensor...now runs in manual mode. Have unit currently set to number 5.