Posted: Sat Aug 27, 2016 4:20 pm Post subject: Frontier timer repair
My frontier timer stopped working after a few years of service. I was able to repair it. Though my aquarium hobby has been on deep freeze after a CO2 disaster, I remembered there were frequent questions on repairing this timer from this community and people often gets fleeced for its repair.
The symptom was that the relay was not turning on. ie no click sound when you turn the timer to on position. This timer uses a capacitive type power supply. The voltage at the relay coil was about 24V when timer is on. The relay (the big black component in the pic) used is of 48V rating. It will work even if the voltage is a bit lower but not as low as 24V. Since the voltage is lower than expected but not completely dead, it suggested that the capacitor had a partial failure. The type of capacitor used is self healing type, ie they will lose capacity slowly but may not fail altogether suddenly. I had a capacitor of same capacity .47uF/400V in my parts bin. After replacing the voltage at the relay is 43V and timer is working fine. Picture showing the location of the timer and my replacement are attached.
There are many clones of this timer, so the internals your timer may not look the same. I myself have two different types. But they all have similar capacitive power supply.
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