Servo testers hav dropped to 2 for abt $15 on AMAZON.CA

Ditto to all that recommended a servo tester as they are inexpensive and help verify if the servo is OK and setting up linkage

I agree either Colin a servo tester is a really good investment. I always check mine before fitting saves a lot of bother it also helps as you can set the Center point without having to connect all the radio gear

Have you put the plugs into the receiver the right way round? Also try the other sockets on the receiver. Just a thought. 😊

Colin makes great point. Servo testers are a very handy tool to have in one's tool box. Inexpensive and versatile.
I sometimes use a servo tester as a speed control with 360 degree rotation servos, ie, for radars.

Try a servo tester to check if the servos have malfunctioned.
If you don't have a tester then try unplugging and cleaning the plug and socket connections as sometimes if stood for long periods can corrode.
Cheers Colin.

Thank you all very much for your support. It’s working! 😊😊

I would always start at the batteries. Are they new or fully charged? Both transmitter and receiver? Does the receiver use a NiMH battery or a NiCD? How long has it been since they were charged and cycled?
You can check your receiver pack switch by eliminating it from between the battery pack and the receiver. I have seen them go bad and cause issues with voltage.
With your manual in front of you, rebind your receiver. When you do this, don't put the receiver right next to the transmitter. Some radios don't like this much and it causes problems. OK, you re-bound.
Had you previously set the failsafes? If so, you might consider un-doing them.
I am guessing that your radio and servos are set for throttle and rudder. If they are not working yet, try them connected to the auxiliary channels of the receiver.
BTY, has your receiver and or servos ever been underwater?
Are the servo cable plug polarized, ie, can they be put into the receiver in only one way? If not, check to make sure that they are installed correctly.
You could try some other servos and see if they work. As long as the cable plus fit into the receiver properly they should work fine.
Lastly, if you are still stuck, do you know anyone with a similar radio that you could try your receiver and servos on?
That is about all I can come up with. Good Luck

Are your servo and battery plugs the correct way round in the receiver ? Black wire to the outside) Battery plug in the battery slot on the receiver? Pics of your radio setup can sometimes help

JB