Laars mini therm jvs75

[Brian0013]

hey guy new to the site looking for some help with my laars boiler.boiler is short cycling i believe.it fires up when thermostat calls for it ,flames for 10 sec or so than shuts off .fire up again another 10 sec am shuts off n so on . I’ve cleaned the flame sensor bled it and check the taco pump.pump working fine

Thank for any help Brian