HI showing on digital display frialator 14ss/chhov
HI is showing as a fault on the digital display, i have lit the pilot and everthing has fired up, about 2 minutes later the main flames dies down but pilot stays lit and says HI. the model is frialatior 14ss/chhov
Re: HI showing on digital display frialator 14ss/chhov
When high is displayed it means that the probe and controller is reading that your oil temp is 30 degrees over your set temp. Use an external probe, locate it about one inch above your probe in the tank check actual temp and compare to your set temp. If you find that it is not 30 degrees over than there may be a problem with your probe, wiring or the digital controller. With a multi meter you can check your probe resitance it should be at 942 ohms at 350 degrees.
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Check if the the gas pressure is sufficient (as stated on unit's nameplate). Check if the hi limit device is good. Check also if the thermopile (cylindrical metal with two wires standing behind the pilot hood) is receiving enough heat from the pilot flame. The voltage generated by thermopile should be 500millivolts in order to open pilot and main valve. If there is 500millivolt on gas valve thermopile and the pilot flame does not stay lit, you have to replace the gas valve. If the thermopile is glowing red and the voltage generated does not reach 500 millivots, you have to replace the thermopile.
You have to check the following: 1. Does the pilot flame has the ability to heat up the thermopile? Themopile must be properly heated in order to generate voltage to open the pilot valve as well as main valve. 2. When the thermolpile is heated, does it generates 500 millivolts? If not, your thermopile needs replacement. If it does and still the pilot flame wont stay lit, your gas valve needs replacement. 3. Does the hi limit device has continuity on its terminals? If there is no continuity on hi limit terminals, you have to replace it. One of the thermopile wire passes on this hi limit terminal to cut the voltage supply on pilot valve in case the oil temperature reaches 450F. 4. Check and tighten all wiring connections, millivolts generated by thermopile will not pass on loosely terminated wiring.
Check the hi limit sensing bulb, it should not touch the fire tube, when it does, it will sense high temperature which will trip its mechanical contacts and will shut pilot and burner flames. Make also sure that the thermopile is free of soot or any form of dirt and is properly heated by the pilot flame.
Assuming that the pilot is lit, when you turn the thermostat from off to the operating temperature, you should hear a click at some point. If you do not, the thermostat is defective. You can also double check this by detaching one of the two wires going to the thermostat and measuring for continuity between the two terminals. At off it should show no continuity. At 200F or above it should show continuity. This is the most common problem.
If the pilot will not stay lit or if it goes out when you increase the thermostat setting, it is usually a defective or weak thermopile (or thermocouple), or a defective gas valve. If replacing the gas valve, I recommend replacing the thermocouple or thermopile at the same time.
Restate your problem if the pilot won't stay lit or if it goes out when you turn the thermostat up.
You can not check a thermocouple by resistence. You have to check it by millivoltage when it is hot and sensing it should be above 500mv. I would be willing to bet that you have some type of particulate in the gas valve that is causing this problem.