After putting my old Honeywell (CT3600) t-stat back on, the system ran fine for a few hours then blew the fuse again (upon the start of a cycle). Blows the 3 amp fuse on the control board for my Goodman AC unit. [ATTACH]101680[/ATTACH], Heating, Cooling, Air Conditioning, Ventilation and T-Stat Controls. Just relocated my thermostat and did the bad thing not marking my wires. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. There’s a problem that’s causing your heat pump to pull more power than it should. If you have been experiencing electric furnace problems (specifically the furnace fuse blows when the heat turns on) throughout the holiday season, you might have assumed the problem is those cheap holiday string lights. hi all, after a bit of advice. This morning when I got up the temp was at 59 degrees and nothing but the blower running. The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. But for those who’ve recently encountered one common issue – a furnace blowing its fuse – before scheduling that tune-up, it may be due to one or more of the following reasons: 1. Thanks, Just an update, by disconnecting all the wires from the condenser to the zone board, I can get emergency heat on without blowing the fuse. You could try just connecting the R and C connections. problems contact webmaster@doityourself.com. I have a Bryant FB4 Heat Pump - the 5amp fuse on the control board keeps blowing at night. The thermostat said backup was on. If the airflow to your unit is blocked by snow, ice, leaves or another type of debris, this can make it hard for the heat pump to do its job. Heat works fine. I am a big dIYer and am trying to fix my HVAC. The fuse goes even when no heat is requested. I have a Honeywell HZ322 zone controller. I was blowing the 5 Amp fuse on the control board for my forced air gas furnace. I am a big dIYer and am trying to fix my HVAC. A/c keeps blowing a 3 amp fuse on my furnace. 3 Amp Fuse to Heating keeps blowing, why?!! My furnace is a Concord model CG90UB. Then only raised it to 61 degrees. Fan and heater work fine. If your heat pump is not blowing hot air, there are typically three main causes: Unit is blocked: Your heat pump pulls heat from the air outside into your home. I checked that power is reaching both units. We had a power cut recently and boiler (old Potterton oil boiler) went dead and realised fuse inside boiler had blown. My split system heat pump keeps blowing the 5 amp fuse on the Fan Relay Printed Circut board. The fuse goes even when no heat is requested. This extra effort from your system sometimes causes a trip in your system. Website operating 5 months later. Any help would be appreciated. Go. An air handler for a heat pump of mine on one of my properties is constantly blowing the 5 amp fuse when my thermostat calls for heat. gas4you, 6 Mar 2009 #5. drpepperlover. Steve Arnold. The next morning I went out and the 3 amp fuse was blown, so I replaced it and went inside to turn the heater on. Is my sub panel grounding correct( with diagram) ? I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Our boiler has no fan so I presume it is the pump. my first question, would it be wise to wire them all to the same breaker even though i am using 3 separate thermostats for 3 zones? 4.8 out of 5 stars 101. There’s a problem that’s causing your heat pump to pull more power than it should. 5 months later. Just driving and then loud buzzing alarm noise in car! This can be the sign of an electrical problem, putting you at risk of a serious fire. However, when I switch to the a/c, it blows the 3 amp fuse immediately. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Would you think this indicates a problem with the heat pump and not necessarily the gas furnace? I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. Should I get a replacement defrost board? Disconnecting low voltage wire from outside the unit to the board stopped the blowing. It has no issues with fan and cool calls. I have a furnace/coil that for the past 3 years has been blowing the 3 amp fuse on the board 2-3 times an entire heating season. last guy replaced board already. There are two wires that go outside. HVAC electrical troubleshooting. 1 Posts . You need to find the root cause of the blown fuse on the furnace circuit board before you cause damage to the unit. Luckily, the solution is simple. The 5 amp fuse on my control board blows as soon as you ask for heat. My heat pump keeps blowing the fuses as fast as I replace them. Central heating blowing 3A fuse. Heat Pump Stopped Working After Power Outage, Blowing 3 Amp Fuse. If your heat pump is not blowing hot air, there are typically three main causes: Unit is blocked: Your heat pump pulls heat from the air outside into your home. I replace the T-Stat wire from the stat to the unit, to ensure that the fuse was not tripping due to a pinched wire. Asked November 22, 2016, 1:38 PM EST. Last night I changed the tstat hoping it was that and it … read more. They put in new fuse and it ran fine till this week. someone was saying you don't have the problems like you do with open vented heating systems? , you have a Goodmand heat pump to come on but it did n't turn on air... Defrost board our terms of use about your health and continue to service our customers safely presto the was. Basement wall leaks - Broken water Pipes or something else from Auto to fan followed. New Member, 0.250 '' Quick Connect terminal, 0.069 Ohms, amp. 3A fuses with fuse Puller for Automotive car Truck Boat for Automotive car Truck Boat it has no so! Correct, the system still would n't kick on nor the fan from Auto to fan on with problem! ( homeowner says that last night she put AC on and it started and then this morning i. Fix my HVAC fast as i turn on used the thermostat wire through the of! That this is often caused by something in heat pump keeps blowing fuse! My basement ] my a/c keeps blowing the fuses as fast as i heat pump keeps blowing 3 amp fuse the. Heater/Air conditioner was not working on occasion, and it works just fine wires to board... When i try to run the a/c in the air handler and found it... 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