621899 – RELAY

Nordyne / Intertherm / Miller OEM furnace relay. Nordyne publishes no public specification sheet for this part number, so coil voltage, contact configuration and contact rating are not stated here – read the relay body markings before wiring.

Specifications from our own stock records. The manufacturer does not publish a public page for this item.

Before you order

Nordyne has superseded 621899 with 621899R — same relay, current service number. Distributor data lists brand-level compatibility across Nordyne, Intertherm, Miller, Frigidaire, Tappan, Gibson, Kelvinator, White-Westinghouse, Maytag, Philco, Garrison, GrandAire, Mammoth and Medallion equipment, but not by model. Note that E1EB-015HA does NOT use this relay, so it is not a blanket fit across the electric furnace line. Always match the full model and serial number on your unit before ordering.

Specs

• BrandNordyne / Intertherm / Miller (OEM)
• TypeFurnace relay
• Manufacturer specs publishedNo
• Coil voltage / contact ratingNot published - read the relay body markings
• Data SourceOTP stock record - not manufacturer-verified

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 621899

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• E2EB-012HB
• E2EB-015HB

What is the difference between a fan relay and a contactor?

Duty and scale. A fan relay switches a blower or an accessory at a few amps off a 24 volt pilot duty coil. A contactor switches a compressor and condenser fan and is built for that inrush and arcing. A relay is not a small contactor. Use one as a contactor and it will pit and weld shut.

How do I pick the right replacement relay?

Match four things: coil voltage, contact arrangement, contact rating and the mounting. A White-Rodgers 90-370 is a Type 184 SPDT with a 24 VAC coil around 77 ohms DC resistance. A 90-340 is a Type 91 DPDT with a 24 VAC coil around 175 ohms. They look alike and are not interchangeable. SPDT gives you one normally open and one normally closed set, DPDT gives you two of each.

How do I test one?

Ohm the coil first, because an open coil is a dead relay. Then energize the coil with 24 volts, listen for the pull-in, and ohm the normally open contacts closed and the normally closed contacts open. A relay that clicks but will not pass current has burnt contacts, and that reads as a dead blower even though the control board is fine.

Why did the relay burn up?

Usually the load, not the relay. A blower drawing high amps because the run capacitor is weak or the wheel is caked with dirt pits relay contacts quickly. Fix the load or you will be back for another relay before the season ends.