Quote Originally Posted by hkempf View Post
Pull the connector off the flame sensor hook one jumper from your meter to the flame sensor and the other to the wire you pulled off of it, fire the system, you should get 0.5 microampers
Do you mean more than 0.5?

Different manufacturers have different minimum microamp requirements. Many units that have clean, undamaged flame sensors will get over 2.0 microamps during operation.