Weil Mclain boiler won't fire:
Okay my circa 1990 Weil Mclain HE-4 gas boiler refuses to fire. I changed the hot surface ignitor a month ago with no problem and it has been firing fine until today. The ignitor glows and you can hear the relays for the firing sequence, then one more click and the ignitor shuts down. The blower runs fine, and the vacuum appears correct, the gas is on at the meter (I have no other gas appliances). Any ideas here? Oh and the HE-4 does have the flame sensor mod and the ignitor is angled down app 15 degrees toward the gas tubes. Thanks!