Question about Heating & Cooling
When I turn on the thermostat it kicks the heater on for only a few minutes and then the system shuts right back off. What do I need to do to fix it?
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Posted on Jan 02, 2017
SOURCE: heater won't stay on
This product does indeed have a problem with the safety switch, that is only supposed to kick in when the unit is turned over. I had a total of 3 units sent to me from Kaz. Each time the unit would work for a short time, then slowly begin to turn off and on. I finally decided to take the unit apart and look for any obvious problems. There is a weighted swivel that will raise a contact point to turn the unit off in an emergency. The contact points would spark off and on, depositing a black carbon on them until they would no longer allow power to pass through. I cleaned the contacts with a fine finger nail file and bent one of the contact arms inward to make better tension between the contacts. This allowed the unit to stay on for longer periods of time. But even with the thermo-stat turned all the way up, the unit does not stay on long enough to heat the room. In effect, what happens is the contacts will continue to ark, putting black deposits on the contacts until you're back to square one. Apparently the unit also has a thermo-stat related problem. I'm sending the unit back again (they only made me send the power cord last time), but will insist on a different model this time. Good Luck
Posted on Feb 24, 2008
Judging by your pics (helpful, by the way) you have a high limit wired into your thermostat wire. Try disconnecting that wire nut connection in front of your valve and hooking the thermostat straight to the top and bottom posts on the valve (eliminating the high limit). If it runs fine, either the connection was poor or your high limit wire is pinched.
Posted on Feb 28, 2008
SOURCE: furnace won't stay running
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
• Locate and correct gas
• Check front cover
operation (hose, wiring,
Correct if necessary.
• Replace or realign
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
length, elbows, and
• Verify proper induced
draft blower performance.
Posted on Nov 25, 2008
SOURCE: oil filled heater wont stay on
I was having the same problem and did a search to find this link. This morning when I turned it on, I backed the temperature down to 66 when it first came on (defaults to 70) and it appears to be working now (it's been on for over 10 minutes)
Posted on Dec 18, 2008
SOURCE: won't stay on
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Warning this will disable the tip over sensor, Unit will not automatically turn off
when knocked over!!
I had the same problem with the "F" appearing and the unit turning off. I read a similar post about the hz-709, that talks of removing the "tip over sensor". To remove the sensor, "two little black boxes on one chip, that rattles like there is a ball bearing in each box."
Remove two small screws on the bottom of the heater then remove two small screws on the top of the heater "top screws are under a small cap that can be popped of with a flat head screwdriver."
Inside long panel front Unplug three wires, White Brown Blue "remember where they where plugged in, so you can plug then back in later."
Inside long panel front there is a silver panel with eight screws on it only the, only the four "corner" screws have to be removed to remove silver panel.
remove silver panel then remove remaining 4 screws, Now remove front control from long panel front, there are 6 screws only have to remove the four inner screws, Open white box, slip large chip off three prongs,
there are two small blue wires connecting to the two small black boxes from the beginning of this post, cut wire from box, twist or solder together, and tape with electrical tape.
"You have just removed/disable the tip over sensor, Unit will not turn off when knocked over!!"
Reverse steps reassemble the unit and enjoy.
Posted on Dec 23, 2008
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