Interrupted duty ignition|30 sec trial for ignition (1.3 sec flame failure response time (FFRT))|Recycle on flame failure|Thermostat/aquastat compatible|Improved SMC (safety monitoring circuit) technology, zero bleed voltage during standby|Oil pump bleed assist up to 1 min|Serviceman reset protection, latch-up after 3 consecutive lockouts|Diagnostic LED's (status, lockout, flame)|Increased flame accuracy|Works well with generators, insensitive to frequency changes|Flame stabilize|Not compatible with T87K or T87N