i just bought a Johnson Digital Temperature Controller i cant program it it keeps i raising the temperture pass the set preset do not know wat i doing wrong
Depends on what model you have, but the Johnson controllers usually have a jumper for heating or cooling. Another possibility is that the differential could be set wrong, allowing for the temp to rise. Example if it a 5 degree dif. and it's set at 70 it wouldn't come on until 75. Do you have instructions, if not look on-line?
CORPORAL BN ARMY “You’re not drunk if you can lie on the floor without holding on.” — Dean Martin
CORPORAL BN ARMY 