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Can i bypass the boiler relay and hook up the two wires going to the circulator pump directly to an electrical outlet to see if it runs

Put in new circulator pump and still wont run ....can i bypass the relay and plug the pump into a outlet to see if it runs and then it will at least tell me the relay went bad

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Posted on Jan 02, 2017

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SOURCE: There is no electricity coming

sounds like you need a wiring diagram-check all ur fuses-pump might be pulling too many amps and blew fuse-might need new fuel pump buddy-if you find a blown fuse-replace pump,relay,filter and fuse

Posted on Aug 10, 2008

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SOURCE: 97 chevy suburban wont start

try putting a dab of solder on each one of the contacts on the fuel pump relay. i had a similiar situation where the relay contacts in the fuse box got strectched out over time so i put a dab of solder on each terminal to beef the contacts up and it worked perfectly. i think this will work because if the mechanic put a wire jumper in the contacts then electrical it is fine.

Posted on Feb 17, 2009

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SOURCE: 93 stang fuel pump wont run

I'll dig into some schematics and see if I can get more info for you. Be back as soon as I can.

Posted on Aug 09, 2009

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SOURCE: 1991 tracker I put in a new fuel pump relay. the

probably becuase its faulty...try replacing it and go from there...or else there is another source of resistance in the circuit some where....also, check your fuses....a blown fuse will stop flow of current as well.

Posted on Nov 14, 2009

  • 37 Answers

SOURCE: Utica Boiler model # MGB100HD with a Honeywell

how did you hot wire it. did you jump the wires on the relay board or use another power source? Does the boiler burner start? Have 120 volts incoming to the relay board? You hear relay click when turning power on/off? If so bad relay, or loose wiring terminals on the board. This control has built in transformer that can burn out, that will stop the pump relay contacts from working.

Posted on Nov 07, 2011

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Heating Circulating Water Pump Problems

Changing your circulator pump is not always an easy process.
I will attempt to explain some of the possibilities for changing out a circulator pump. First of all I would recommend that if you are reading this and you do not have an extra circulating pump in the basement beside the boiler. That you stop by your local heating and air conditioning supply house and buy one. For under one hundred dollars it will be cheap insurance.

The very first thing you need to know is the water temperature in the boiler. If the water is hot, 140F or above than the problem is not the boiler. It is heating the water. The next thing will be to see if there is power coming to the circulator pump. Either take the electrical cover off of the circulator pump motor, or check for voltage at the source of the wire going to the circulator pump. If there is no voltage, usually 110 volts for the US, then you have to look at why the motor is not getting power. I will do another article on that issue at another time.

So now we have established that you have power coming to the motor. There is hot water in the boiler however the pipes going to the radiation are cold. The next thing to look for, are zone valves. They are little motorized valves that open and shut to direct the flow of heat to different parts of the house or building. It is possible that one of them could fail and the circulator pump is running and moving no water. Usually the circulator pump will be making a noise and often be very hot if this is the case. Of course then you need to check the zone valve. That, we will also cover later.

The first thing you need to do to change the circulator pump is to make sure that the electricity to the circulator pump motor is turned off. Verify that the power is off before touching the wires. The wires then need to be disconnected at the pump motor. Then the 4 bolts that hold the circulator pump in place need to be removed. Save these bolts, they may be needed to install the new pump. Carefully remove the pump from the flanges. A pry bar or screw driver may be needed to break the pump lose from the old flanges. Be careful of the motor, depending on the type of failure, the motor can be very hot.

If you had a responsible installer do your heating system, then you will have a valve in the piping on either side of the circulator pump. These valves will isolate the circulator pump from the rest of the heating system and changing the circulator pump will be fairly painless. If you do not have valves closed to the pump, then you will need to find the valves that will be the closest to either side of the pump and close them. For some older installs there may not be any valves and you will have to drain most of the water out of the system to change the pump.

This can get very complicated and professional help may be needed. The hardest part may be refilling the system and getting the air purged back out of the piping.

To install the new pump, clean the old gasket material from the flanges and install the new gaskets on the new pump. Carefully insert the new pump with gaskets into the flanges. Be careful not to damage the gaskets. Then install the 4bolts that hold the circulator pump in place. Tighten the bolts just so they are snug and not too tight. If they leak a bit you can always make them a bit tighter to stop the leak. Too tight may damage the gaskets. Hook up the wires to the pump motor again. Open the valves back up and check for leaks. Adjust bolts as needed. Apply power to the system and start the motor to check the operation of the circulator pump.

on Dec 24, 2009 | Heating & Cooling

3 Answers

Secondary air injection pump not working. Checked voltage on it and got 2.81 volts. put 12 volts on it and pump worked

the air injection pump has a relay in the power distribution box that is controlled by the computer. it gets 12 volts when the relay is closed. the relay can be bad

Mar 29, 2015 | Lincoln Cars & Trucks

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Check engine light on secondary air pump not working. works with 12 volts but is it suppose to be less then 12 volts?

12 volts. there is a relay that supplies 12 volts to the pump when closed. this relay is in the power distribution box.

Mar 28, 2015 | Cars & Trucks

1 Answer

Electric fuel pump works when hooked directly to battery but not to original leads

Many shade tree guys will tell you run a switch and direct wire. This is not a good answer. The circuit includes an oil pressure switch which kills the pump in the event of an accident, to prevent the pump from running and feeding gas to a possible fire. There is also a bypass to supply juice while cranking. Fix it right! Check fuel pump fuses (sometimes two) and fuel pump relay.

Mar 27, 2015 | Cars & Trucks

2 Answers

Could I run a electric fuel pump on my 1998 Cadillac deville?

if it did not have an electric fuel before then the installation of an electric pump is a relatively easy process. If you have an electric pump already fitted but it has failed then remove it and install the new pump in its place. Take care to check all wires, fuses and relays and any pressure sensors for correct operation. Remove and blank of the opening for any mechanical pump on the engine
For new installation select an easily accessible place under the vehicle that can be protected from flying rocks and road debris. Run a power wire (red colour) from the run side of the ignition switch to the relay ( to be fitted ) near the battery or in the engine bay. Run this wire through an inline fuse close to the ignition switch to protect the circuit. attach to a coil actuation terminal of the relay.( look at the base of the relay for terminal identification. Run a black wire from the other side of the coil actuation pin on the relay to earth. Normally the same bolt that mounts the relay. Run a red wire capable of carrying 20 amps directly from the battery terminal through an inline fuse ( close to the terminal) to a power pin on the relay. Run another red wire from the outlet power pin on the relay to the electric pump. . Run an earth wire from the pump to earth.
This is a basic electric circuit for the installation of the pump. If there is a requirement for a pressure regulator or pressure sensor to control the pressure or pump operation , that control wire will be connected in series into the wire from the ignition switch so that when the pressure is reached then it breaks the circuit to the relay from the ign. switch and the pump will stop operation until the circuit is again completed. When the ignition switch is off there will be no power for the pump

Oct 09, 2014 | 1998 Cadillac DeVille

1 Answer

Utica Boiler model # MGB100HD with a Honeywell Aquastat Relay model # Type L8148E will not operate the circular pump. THe damper works and I can hot wire the circulator pump but it won't turn on...

how did you hot wire it. did you jump the wires on the relay board or use another power source? Does the boiler burner start? Have 120 volts incoming to the relay board? You hear relay click when turning power on/off? If so bad relay, or loose wiring terminals on the board. This control has built in transformer that can burn out, that will stop the pump relay contacts from working.

Nov 07, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

This is an early model livia 90 (~1994). Problem is no heating of water. Pump works but neither heating light or pump light comes on. I determined the power relay was not closing. Replaced it with new...

I would check the level probes on top of the boiler. There is a yellow wire going to the high level( left) and a green wire going to the low (right) probe. The probes get scaled and do not sense water. If there is no sensing of the right probe ( low water) it will not heat. They both need to be cleaned. There is a nut or a big nut that will allow for the removal. Clean both probes and it should go back to normal.

Dec 26, 2009 | Pasquini Livia 90 Espresso Machine

1 Answer

Furnace firing. Plenty of hot water. No heat.

Most Boiler and zone controlled systems I can remember working on with up to 8 or so zones, the Bell&Gossett circulating supply pumps or pump ran all of the time to keep the upstairs baseboards warm.If you have a relay that controls the pump, see if you can bypass it and if it comes on, replace it. Be sure all of the coils on the zone valves are energized and opening, if it is set up that way.Get back to me and let me know.
Sincerely, Shastalaker7

Nov 06, 2009 | Heating & Cooling

1 Answer


Commonly outdoor wood boilers use a hot water coil mounted in the ductwork above your furnace. In this application the Ruud furnace is still using its blower assembly to circulate the warm air from the boiler to your home. If this is the case. Have your heating guy install a #50 relay on the furnaces blower motor to activate your much needed humidifier. If this is not the case and your Ruud furnace is totally independent of the boiler. Still install the #50 relay in the furnace and manualy activate the fan only feature on your thermostat.
Good luck
HVAC Teacher

Feb 21, 2009 | Aprilaire 600 Humidifier

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