Troubleshooting Guide, No power to humidifier

TROUBLESHOOTING Guide

If a problem arises with the Aprilaire Model 800 Steam Humidifier, please review the following troubleshooting guide for possible causes and solutions.. If the problem persists, call Aprilaire Tech Support toll-free at 1-800-334-6011.. Please be prepared to describe the exact nature of the problem..

TABLE 5 – Troubleshooting Guide

Problem

Possible cause

Action

Humidifier does	No power to humidifier	• Check main power supply.
not energize; steam		• Check main line safety switch.
canister does not		• Verify terminal block electrical connections.
heat up, display		• Verify terminal block electrical connections.
heat up, display		• Verify humidifier is turned on.
lights not on		• Verify humidifier is turned on.
lights not on
	No power to low voltage	• Check for proper supply voltage.
	control circuit	• Verify terminal block electrical connections.
		• Check for control circuit voltage, 24 VAC.

	Control terminals	• Check if auxiliary limit controls are not allowing system to operate, e.g., high limit
	are open	humidistat, airflow proving switch, etc.. Reset, replace, or calibrate as needed..

	ADHC faults:	• Check terminals for 24 VAC.
	• Open, shorted,	• Check control circuit wiring.
	or incorrect wiring
	of control

Steam canister failure	Improper wiring	• Verify proper electrical connections.

	Mineral buildup	• Inspect steam canister for severe mineral buildup on or around electrodes. If severe
	on steam canister	mineral buildup is present, replace steam canister..
	electrodes

	Steam canister electrode	• Inspect electrodes for surface corrosion or pitting. This is usually caused by a high
	corrosion	chloride level in the supply water.. Replace steam canister..

Unit does not fill	No water supply to	• Verify that manual water supply valve is open and that pressure exists.
with water	fill valve	• Check if in-line strainer in inlet port of fill valve is plugged. Clean strainer or replace.

	Unit control is not on	• Press On/Off switch.

	Malfunctioning fill valve	• If fill valve does not open:
		– Check for obstruction in valve..
		– Verify fill valve electrical connections..
		– Verify proper 24 VAC to fill valve.. If voltage is present and valve does not open,
		replace valve..

	Drain valve is open	• Check for obstruction in drain valve.

Fill valve does	Malfunctioning level	• Check that high water sensor electrical plug is fully engaged.
not close	control system

	Fill valve is stuck	• Check if there is an obstruction that does not allow valve to seat properly. Clean or
		replace valve as needed..

	Drain valve is open	• Clean or replace drain valve if an obstruction in the valve does not allow complete
		closure..

model 800 specifications

The Aprilaire Model 800 is a powerful and highly efficient whole-house steam humidifier designed to provide optimal humidity levels throughout your home. This innovative product is particularly beneficial for homeowners seeking to maintain comfortable living conditions while enhancing air quality.

One of the standout features of the Model 800 is its capacity to generate up to 34 gallons of moisture per day. This remarkable output makes it suitable for larger homes or those with multiple rooms that require humidity control. It can effectively humidify living spaces ranging from 3,000 to 6,200 square feet, ensuring that every corner of the house is adequately served.

The Model 800 employs advanced steam technology, which allows it to generate steam that is then distributed throughout the home’s heating system. This method ensures consistent and efficient moisture distribution, unlike traditional humidifiers that may struggle to cover larger areas. The steam created is clean and free of significant mineral content, reducing the risk of “white dust” that can accumulate when using some other types of humidifiers.

Another key characteristic of the Model 800 is its user-friendly interface. The unit features a built-in humidistat that continually monitors and adjusts humidity levels according to the specific requirements of your environment. Water usage is optimized and can be tailored to your home’s needs for enhanced efficiency.

Installation flexibility is a notable advantage of the Model 800 as well. It can be connected to various types of heating systems, including forced air and hydronic setups. This versatility makes it a great choice for different residential applications.

Furthermore, Aprilaire has incorporated low maintenance design considerations into the Model 800. The steam unit is designed with a replaceable canister that helps simplify routine care. Homeowners can enjoy the benefits of this humidifier without the burden of frequent upkeep.

Overall, the Aprilaire Model 800 stands out in the market for its performance, innovative technology, and user-friendly features. It is a reliable solution for anyone looking to enhance indoor air quality and comfort throughout their home. Whether in winter when dry air is prevalent or in any other season, the Model 800 ensures a comfortable and healthy living environment.