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Comfort Zone CZ-530 Compact Heater - Page 4 Questions & Answers
Flashing e4 won't cut on
An E0 or E4 error is most commonly caused because the unit has not been run with sufficient fresh air ventilation and the flame current sensor and burner gauze have deposits built up on them. Cleaning the flame current sensor and burner gauze with a steel wire brush will remedy this. If this does not cure it then the problem is pump related due to contamination. These pumps are very difficult to service and may not be repairable at all if the teflon coating on the steel piston inside the pump has become scratched. You will need to replace the entire pump assembly (available from ourselves). Stick to good quality fuel ( not kerosene) and make sure you have adequate fresh air ventilation entering the area where it is running - yes that does mean leaving a window open.
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