20 Most Recent Hotpoint REM25SJ Microwave Oven Questions & Answers

Magnetron is probably faulty.

Hotpoint REM25SJ... | Answered on Dec 22, 2017

Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:


So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link:

Hotpoint REM25SJ... | Answered on Dec 12, 2011

your fuse in micro wave is going bad.

Hotpoint REM25SJ... | Answered on Feb 23, 2011

its pci mec is detecting a FAULT the unit needs to be fixed by a service tech

hope this helps please rank this advice

Hotpoint REM25SJ... | Answered on Feb 15, 2011

A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

I hope this helps.

Good luck.

Hotpoint REM25SJ... | Answered on Dec 06, 2010

Welcome to FIxya
If you are Experiencing Problem during cooking-it seems to Steam activating the sensor.
You have to avoid creating too much steam.
When microwaving foods with a lot of moisture, you should cover most of the bowl/etc with plastic to contain most of the steam. You can also select a lower energy level to cook/warm your food. The sensor is pretty sensitive.
Thanks for Contacting FixYa...

Hotpoint REM25SJ... | Answered on Jul 12, 2010

You may have a shorted high voltage diode, but I would suspect that you also have a failed magnetron, and with the burns you mention, the waveguide of the oven is possibly damaged, which is unrepairable.

Details covering some previous models are in their bulletin here. Even if your model is not on the list, the same problem can occur.

That bulletin has a picture of a burned waveguide.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Hotpoint REM25SJ... | Answered on May 28, 2010

I woud advise scrapping as microwaves are rarely worth repair - I am an approved appliance tester and annually fail 10% for dangerious emmision levels

Hotpoint REM25SJ... | Answered on May 26, 2010

hi.. i'm sorry to hear your problem..
i have a link that may help you figure it out more in depth..

good luck but if i was both of you, i would not buy this model again since it seems to be a faulty model.. thanks, d

Hotpoint REM25SJ... | Answered on Feb 26, 2008

there is probably a loose contact in the pc board at the front or alternatively the powersupply in the mwave .canbe a number of diff things sorry i could not b of more help

Hotpoint REM25SJ... | Answered on Feb 23, 2008

There is a chip that controls TOTAL operation of the microwave, sounds like it malfunctioned. It actually sound like the entire board has malfunctioned. good luck

Hotpoint... | Answered on Mar 02, 2019

Many microwaves have similar issues. Usually, (not always) only the light is on and the fan is running, not the section that produces the microwaves. This problem can be caused by the door switches that are out of alignment or a defective control board.

Hotpoint... | Answered on Nov 15, 2017

Most microwave diodes will work just fine from system to system. The most common ones I use are rated at 550ma. When you check your old diode what made you think it was bad? They are such a high rating you will not get a reading on it with a regular ohm meter. Mostly on HV rectifiers if it is not shorted ( Zero Ohms) it is probably good. If you have no high voltage then substitute it and see if you do get high voltage, then you know it was open. Follow the video and give it a try.

Hotpoint... | Answered on Aug 24, 2017

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