How to wire oil furnice protector relay

Rheem furnace error code 68 is a mechanical relay system which signals the blower motor to stop because it has not received a signal from the thermocouple.
Jul 20, 2022

Rheem furnace error code 68 - HVAC Contractors

Motor Power And Communications Issues (Fault Code "68")

ManualsLib https://www.manualslib.com > Rheem-96v-Series
Motor Power And Communications Issues (Fault Code "68"); Line Voltage And Low Voltage Connections To The Communicating Motor - Illustrations - Rheem 96V Series ...

..

If you have a programmable thermostat do the batteries need replacing? Test and re-insert. While there check for any loose wires on it, or at the furnace circuit board. Also make sure none of the wires are touching and metal parts and getting chaffed or shorted. If they are the shot will keep the unit from shutting off and/or cause short cycling.

sonds like u have a bad safety switch they r round and have 2 wires on them usually and u can check them by taking the wires off of them and checking continuity thru them there might be one on the blower housing also either that or ur blower relay may be bad and stuck closed

Try and jump it out by taking the wire hooked to R and W terminals on your thermostat and connecting them. It could be you have a bad thermostat.

You will likely need to install an isolation relay in the W circuit from the thermostat. Some thermostats rob a small current through the W circuit to power the thermostat. This small current can be enough to start the fan circuit timer. You can test this by disconnecting W at the furnace and allowing the timer to shut down. If the fan shuts off with the W disconnected you can install a simple relay.

The relay coil will be connected to Common on one side and the W from the thermostat to the other. Then you will run a wire from R on the furnace to the relay and from the N.O. Contacts to the W terminal on the furnace. This will kill that signal that is starting the timer and the W can steal it's power through the coil back to common.

Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

no the older rheems had a sequencer for the heat that turned on the blower at the same time that the heat strios are energized. so the first thing that you need to do is figure out the sequencer that is keeping the fan running and get it replaced.

this is more than a fan control relay . it is a black relay that will appear to have several wires connected to it but those wires connect to the base ,it unplugs , if it is set up for ac it might have 2 relays one toward the front one toward the rear replace the front one first ,,, if on good replace one @ rear should fix if not let me know

switch t-stat to on, for quick solution...still got problem with relay or something