Janitrol Thermostat Hpt18 Just Replaced Old Janitrol Hpt18-60 Thermostat With New Programable Stat. Everything Working Okay Till Earlier

Just replaced old janitrol hpt18-60 thermostat with new programable stat. Everything working okay till earlier - janitrol thermostat hpt18

Outdoor unit still works. Within non-operating fan or blower. The accumulation of ice on the external lines.