I have a Coleman Evcon EB 17 B electric heater. When I set the temperature at the thermostat the heating element heats up but the blower does not start. I can operate the blower at the on/off switch at the Map Timer Kit # 7681-8291/A. I have inspected the Timer Kit circuit board and relay but have not found any burn marks or damage.

On many of those Coleman units the heat sequencer controls the blower in the heat mode only. It could be the heat sequencer.