RV Appliance Repair From the Fridge to the Cooktop

Absorption Refrigerators and How They Die

An absorption fridge has no compressor. It uses a sealed cooling unit charged with ammonia, water, hydrogen, and a corrosion inhibitor, driven by heat from either a propane burner or an electric element at the boiler tube. Heat drives ammonia out of solution, it circulates, condenses, evaporates in the cooling coil, and absorbs back into the water. There are no moving parts in the sealed system at all, which is why these units can run for fifteen years and also why they cannot be recharged when they fail.

The dominant failure is a plugged or corroded boiler tube. Over years, the inhibitor breaks down and sodium chromate sediment settles in the boiler section, restricting flow. Symptoms are a fridge that cools poorly on both propane and electric, a boiler tube that is much hotter than it should be, and sometimes yellow residue staining down the back of the unit. Once you see yellow powder or smell ammonia at the vent, the cooling unit is finished.

Leveling damage is the other big killer. Running an absorption unit significantly off level, particularly parked overnight on a slope, lets liquid ammonia pool in the wrong section of the tubing. The circulation stops, the boiler runs dry, and the tube overheats and crystallizes internally. That is permanent. A few degrees off is tolerable while driving because the motion keeps fluid moving, but parked and off level for hours is what causes the damage.

• Poor cooling on both propane and electric points at the sealed cooling unit
• Yellow residue or an ammonia smell at the rear vent means the charge has escaped
• A boiler tube far hotter than normal indicates sediment restriction inside
• Parked and off level for hours is what causes crystallization, not brief driving tilt
• Weak cooling on propane only usually means burner, thermocouple, or gas supply
• Weak cooling on electric only usually means a failed heating element or relay

Residential Fridge Conversions

When an absorption unit is done, converting to a residential refrigerator is often the better spend. You get real cold storage, faster pull down, no leveling sensitivity, and a unit you can replace at any appliance retailer for a fraction of what an RV specific fridge costs. The cabinet opening usually needs modification, since residential dimensions rarely match the old cutout, and the mounting has to be built to hold a heavier appliance through road vibration.

The electrical side is the part owners underestimate. A residential fridge runs on 120 volt AC continuously, which means it needs inverter power when you are not on shore power, and that means the battery bank has to actually support it. A modern efficient unit draws roughly one to two kilowatt hours per day. If your coach has two group 27 lead acid batteries and a 1,000 watt inverter, the fridge will run the bank flat overnight. That conversation happens before we quote.

We also address the old vent openings. The exterior upper and lower vents that served the absorption unit become unnecessary penetrations in the sidewall and get sealed properly or repurposed for cabinet ventilation. Left open, they are a water intrusion path and a pest entry. Doing that correctly is part of the job, not an add on, and it is one of the differences between a conversion that lasts and one that causes sidewall damage two years later.

Cooktops, Ovens, Igniters, and Thermocouples

Propane cooktops and ovens are mechanically simple and they fail in predictable ways. A burner that clicks but never lights usually has a fouled igniter electrode or a blocked orifice. A burner that lights and goes out when you release the knob has a thermocouple problem, the same principle as on a water heater. An oven that runs hot or cold is a thermostat, and an oven that will not hold flame after warming up is often a safety valve losing its heat signal.

Orifices clog with dust, cooking residue, and occasionally insect debris on a rig that sat. Cleaning them is not glamorous work but it solves a lot of complaints for a fraction of what a new cooktop costs. Igniter electrodes need a clean tip, correct gap, and a solid ground. If a spark module fires all burners when you turn one knob, that is normal on many RV cooktops and not a fault, which saves people from buying a module they did not need.

The one thing we take seriously on every cooktop and oven job is the gas connection. Flare fittings, flexible connectors, and the shutoff at the appliance all get leak tested with solution or an electronic detector before the rig leaves. Vibration loosens fittings over thousands of road miles, and a slow leak behind a range is one of the few RV faults that is genuinely dangerous rather than just inconvenient.

• Clicking with no flame is usually a dirty electrode or a clogged orifice
• Flame that dies when the knob is released points at the thermocouple or safety valve
• Uneven oven temperature is typically the thermostat, not the burner
• All burners sparking together is normal behavior on many RV cooktops
• Every gas fitting disturbed during the job gets leak tested before delivery
• Range hood fans usually fail at the switch, the motor bushing, or a chafed harness

Microwaves, Convection Units, and Range Hoods

A microwave that runs, lights up, and turns the tray but does not heat has almost always lost the magnetron, the high voltage capacitor, the diode, or a thermal fuse. Those are all serviceable in principle. In practice, the parts and labor for a magnetron replacement frequently exceed the cost of a new over the range RV microwave, and we will tell you that instead of selling you the repair. Where it makes sense to repair is a door switch, a control panel, or a fan motor.

Convection microwave combos are a different calculation. They are expensive units, often built to a specific cabinet cutout and trim kit, and a direct replacement can run well over a thousand dollars before installation. On those we go further into component level diagnosis, because a failed relay on the control board or a burned out convection fan is genuinely worth fixing on a unit that costs that much to replace.

Range hoods are the simplest appliance in the coach and the one most often ignored. The failures are a worn fan motor bushing that howls, a switch that lost contact, a light socket that corroded, or a chafed harness where the wiring passes through a cabinet edge. Almost all of it is repairable for the cost of an hour or two of labor and small parts, and a working hood fan meaningfully reduces the moisture that ends up condensing in your cabinets.

Washer Dryer Combos and Control Boards

Combo washer dryer units in an RV live a hard life. They are ventless or vented condensing machines running on a chassis that flexes, often on marginal shore power, and the drum bearings and suspension take the same abuse the coach does. The failures we see most are drain pump blockages, door seal leaks, out of balance faults from a worn suspension, and a heating element or thermistor failure that leaves clothes wet at the end of a cycle.

Leveling and mounting matter more than owners expect. A combo unit that is not sitting square in its cabinet, or that lost a shipping bracket that was never removed correctly at install, will beat itself apart on spin. Before we chase electronic faults we check the mounting, the feet, and the transit hardware, because an out of balance error is far more often mechanical than it is a bad board.

Control boards do fail, and here the root cause is usually power quality. Voltage sag at a pedestal, an unstable generator, or a modified sine wave inverter feeding a machine that expects clean AC will cook the board over time. When we replace one, we look at what fed it. Putting a new board into the same bad power situation is the definition of a repeat visit, and we would rather have that conversation once.

• Clothes still wet at cycle end usually means a heating element or thermistor
• Out of balance errors are more often mounting and suspension than electronics
• Drain pump blockage from lint and debris causes most no drain complaints
• Door seal leaks show up as a stain at the front of the cabinet base
• Control board failures trace back to voltage sag or unstable generator power
• Modified sine wave inverters are hard on modern appliance electronics

Parts Availability on Discontinued Models

RV appliance manufacturers discontinue models faster than the coaches wear out. A ten year old fridge or cooktop is frequently out of production, and the factory support may be gone entirely. That does not automatically end the repair. Many components are shared across model families, and a thermostat, gas valve, igniter, or element from a current unit will often carry the same part number or a documented supersession. We check that before declaring anything unobtainable.

Where it gets hard is cabinet specific and cosmetic parts: door panels, trim kits, hinge assemblies, control fascia, and anything molded to a particular opening. Those are commonly gone with no substitute. In those cases the options are a used part from a salvage source, fabricating a replacement in house, or replacing the appliance with a current unit and modifying the opening to suit.

We are upfront about this at the estimate stage rather than after your rig is torn apart. If a critical part is questionable, we source and confirm it in hand before scheduling the labor. Nobody should have a coach sitting open in a bay waiting on a part that was never actually available, and holding a bay for weeks costs both of us.

Repair or Replace, and What It Costs

The rates are simple. Mechanical labor is 260 per hour. Diagnostic labor is 285 per hour, credited against an authorized repair. Parts carry 100 percent markup at or under 100 dollars and 35 percent over 100 dollars. Sales tax of 7.75 percent applies to parts and materials only. Jobs above 2,000 take a 50 percent deposit. Every quote we hand you is built from exactly those numbers, and we will walk the math line by line if you want it.

Worked example, oven igniter. Half an hour of diagnostic bills 142.50 and comes back as a credit on authorization. Repair labor of 1.5 hours at 260 is 390. A 62 dollar igniter is under 100, so it marks up 100 percent to 124, with 9.61 in tax. The invoice is 523.61, and that includes pulling the range, replacing the igniter, verifying flame carryover, and leak testing every fitting we touched.

Worked example, absorption cooling unit replacement. Labor of 7 hours at 260 is 1,820 to pull the fridge, transfer the controls and burner assembly, install the replacement cooling unit, repack the insulation, and commission it on both propane and electric. A 1,450 cooling unit marks up 35 percent to 1,957.50, with 151.71 in tax. Total 3,929.21, deposit 1,964.61. Compare that to a residential conversion: 9 hours labor at 260 is 2,340, a 1,100 fridge and 180 in framing materials mark up to 1,728 combined, tax 133.92, total 4,201.92.

Here is the honest call on a twelve year old absorption fridge. Spending 3,929 on a cooling unit for a box whose door seals, control board, hinges, and burner are all the same age is usually a poor trade. You have bought the one component that failed and inherited every other component about to. Unless the box is pristine or the coach layout makes a conversion genuinely impractical, we recommend either a new absorption unit or a residential conversion at a similar price with a much longer service life ahead of it.

• Bottom of the range: igniter, thermocouple, thermostat, element, or range hood fan
• Middle of the range: gas valve, control board, cooktop replacement, or washer pump and suspension
• Top of the range: absorption cooling unit, full fridge replacement, or residential conversion
• Add cost when a cabinet opening has to be modified or a doorway is too narrow for the appliance
• Diagnostic time at 285 per hour comes off the invoice once you authorize the repair
• We will tell you when a repair costs more than the appliance is worth