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Furnace does not fireup - Honeywell Heating & Cooling

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Replace the pressure switch.

Posted on Dec 21, 2008

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Stopped heating yesterday...fan runs, but no heat... any parts available? Pretty sure is 120v ac.


Furnace Troubleshooting & Repairs ' HomeTips

www.hometips.com/repair-fix/furnace-problems.html
Nov 25, 2015 - If your heater doesn't heat or works poorly, this furnace repair guide will help you troubleshoot and fix typical furnace problems with step-by-step advice. ... If your furnace's motor runs but the blower doesn't move air, the belt that ..... a tune upbut couldn't really find any thing wrong . last night and today when ...

Furnace Not Blowing Air? A Furnace Troubleshooting Guide

asm-air.com/heating/furnace-not-blowing-air-troubleshooting/
Dec 1, 2014 - A furnace works by a very simple principle, it uses some type of fuel ...This series of heated coils (called a heat exchanger) has a fan ... Today we will address the most common causes of a furnace not blowing air, and what you can do tofix it. ... It seems like this would be a no-brainer, but I can't tell you how ...

Simple Furnace Fixes ' The Family Handyman


Jan 01, 2016 | Heating & Cooling

1 Answer

How do i bypass the furnace and still use the duotherm 57915.531


Do you have the digital thermostat? You can tell the thermostat you have no furnace. You should be able to disconnect power at the furnace, but the 12v power for the circuit board is provided by the furnace circuit on some systems so make sure you disconnect the wire going to the furnace and leave the wire feeding the circuit board.

Oct 06, 2014 | Coleman Dometic Duotherm Rv Air...

1 Answer

How do you install the thermostat?


Hello my name is Heath it will be my pleasure to assist you. Red wire to R terminal on the urnace and the thermostat. White furnace and the wire to W or w1 on the thermostat nd the furnace, Use the brown wire on the W2 terminal of the furnace and the thermostat., Yellow wire to the y or y1 terminal on the furnace and the thermostat, Green wire to the G terminal on the furnace and the thermostat, Use the black wire to common on the furnace and the C terminal of the thermostat, Use the blue wire on the Y2 terminal of the furnace and the thermostat if you have a two stage air conditioner.

Sep 05, 2011 | Heating & Cooling

1 Answer

Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Heating & Cooling

2 Answers

I have a DuoTherm BriskAIr 13.5K BTU. The Dometic thermostat also controls my HydroFlame 8531-IV furnace. This morning, the furnace would not come on. I checked the wiring and there is no voltage at the...


If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

Jun 14, 2009 | Fujitsu 24C1 Air Conditioner

1 Answer

Furnace has a mind of its own


If your thermostat no longer controls your furnace possibly could be the control board in the furnace or a shorted fan relay.

Jun 10, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Mobile home furnace with central air unit water coming out of fur


You had the condensate from the furnace come loose look for a pvc pipe coming off the furnace it drains the high efficiency heater. I would really check out your hot water heater too.

Nov 25, 2008 | Heating & Cooling

1 Answer

Furnace problem


The problem is most likely in the control module of the roof air unit. Dometic uses the thermostat to activate and deactivate a relay in the control board of the roof ac unit whiich is just visible when you remove your air intake screen. The two blue with white stripe wires are the furnace control wires.

The furnace turns on and off by the opening and closing of relay. Most likely, the furnace control relay is stuck in the on position. On the thermostate, remove the fur wire and see if the furnace quits afrer it cycles down...it does not quit right away. With the termostat out of the loop, if the furnace does not shut down, the problem is in the control box. They are not hard to replace but you must be careful with the live wiire from the 110 ciucuit breaker. If you are not comfortable with the repair, take it to a dealer. The part number is on the assembly box. They need to know if you have the heat srip option or whatever othert options our Roof AC has. If the furnace still runs with the blue/white wires disconnected, the furnace wires are shorted somewhere between the furnace and the AC control unit.

Aug 21, 2007 | Dometic Rooftop RV Air Conditioner

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