Water Heater Repair in Egypt

Symptoms

• The water is lukewarm, not hot
• The power light is on but nothing heats
• The heater switches on and off quickly
• A high bill even though the water is lukewarm
• Steam only from the top vent

Likely causes

1. A burnt-out heating element (electric — the most common)
2. The flame going out (gas)
3. A failed thermostat
4. Scale on the element reducing heat transfer
5. Low supply voltage
6. A temperature sensor (NTC) giving wrong readings

Symptoms

• Water on the floor around the heater
• Drips from the top or bottom fittings
• Drips from the safety (pressure relief) valve
• A rust stain on the heater body
• Water running down the sides of the heater

Likely causes

1. Loose water inlet or outlet fittings
2. The safety valve opening because of high pressure
3. A tank cracked by rust (the end of the heater's life)
4. A corroded anode rod and a leak from the tank base
5. A cracked heating-element gasket
6. A heat exchanger leak

Symptoms

• The flame dies after you release the button
• The flame lights for a few seconds, then goes out
• It is hard to light
• The flame is weak (yellow instead of blue)
• Clicking without the flame lighting

Likely causes

1. A faulty thermocouple (pilot models — the most common)
2. Flat batteries or a torn water diaphragm (battery-ignition models)
3. The flue sensor cutting out because the flue is blocked or ventilation is poor — a safety device that must never be bypassed
4. A pilot or burner jet clogged with dust
5. A burnt-out magnetic valve
6. Low gas pressure, or air in the line after a long outage

Symptoms

• Weak hot-water pressure
• Normal cold-water pressure
• The heater takes a long time to heat a small amount
• Dripping from the shower hose
• A strange noise from the heater when the tap is opened

Likely causes

1. Scale inside the heater (tank or heat exchanger)
2. A clogged inlet filter
3. A cracked outlet hose
4. A faulty bathroom mixer
5. A blocked hot-water pipe in the walls
6. A pressure-reducing valve set too low

Symptoms

• Scalding hot water
• The heater never switches off
• The power light stays on all the time
• A sudden jump in the electricity bill
• The safety valve opening because of the heat
• A boiling sound from the tank

Likely causes

1. A failed mechanical (bi-metal) thermostat
2. An electronic (NTC) thermostat reading wrongly
3. A failed thermal cut-out (the high-limit safety switch)
4. A sensor coated in scale
5. Damaged wiring between the thermostat and the element
6. A faulty electronic control board

Symptoms

• The breaker trips within seconds of switching on
• The breaker feels hot
• The whole apartment loses power
• A burning-plastic smell from the heater
• A slight shock when touching the hot tap (serious danger!)

Likely causes

1. A burnt-out element shorting to earth — a risk of live water
2. A power cable damaged by moisture
3. A blown internal fuse
4. A shorted thermal cut-out
5. A weak breaker or one with the wrong rating
6. Water leaking onto electrical parts

Symptoms

• No water from the hot tap
• The cold tap works normally
• A ticking sound from the hot tap but no water
• Only drips instead of a flow
• The heater is empty

Likely causes

1. The inlet valve is closed
2. A blockage in the water inlet to the heater
3. A faulty bathroom mixer
4. A cracked outlet hose letting in air
5. Instant heaters: water pressure below the minimum needed to switch on
6. A clogged internal filter

Symptoms

• Water hot enough to scald
• Heavy steam from the tap
• A boiling sound from the heater
• The safety valve dripping because of the high pressure
• The outside of the tank is very hot
• A hot-plastic smell

Likely causes

1. A failed thermostat that does not switch off
2. A failed thermal cut-out (the high-limit safety switch)
3. A temperature sensor (NTC) reading too low
4. The setting is too high (85°C or more)
5. A short between the thermostat and the element
6. A faulty control board

Symptoms

• A boiling sound
• Intermittent ticking
• Gurgling
• Slight vibration
• A metallic knock inside the tank
• Whistling

Likely causes

1. Scale building up on the element
2. Flakes of scale loose in the tank
3. Air in the hot-water line
4. A loose safety valve
5. High water pressure on the heater
6. Metal expanding as it heats

Symptoms

• A strong or faint gas smell near the heater
• Bubbles on the gas line when soapy water is applied
• Headache or dizziness near the heater
• A hissing sound from the gas fittings
• A yellow flame instead of blue

Likely causes

1. Loose gas connections
2. A cracked gas hose
3. A magnetic valve that does not seal fully
4. The flame is out while gas is still flowing
5. Corrosion in the copper gas line
6. Loose burner connections

Symptoms

• Yellow or brown hot water
• Clear cold water
• A metallic taste in the hot water
• Rust stains on clothes after washing
• Sediment at the bottom of a glass of hot water

Likely causes

1. A depleted anode rod that no longer protects the tank
2. Rust starting on the tank walls inside
3. Corrosion in the copper inlet pipe
4. A cracked glass lining inside the tank
5. Hard water speeding up corrosion

Symptoms

• A constant drip from the valve
• The sound of water running in the valve line
• Water on the floor around the heater
• A boiling sound
• The water is hotter than the setting

Likely causes

1. Very high water pressure into the heater
2. A faulty thermostat overheating the water
3. The valve itself failing to seal
4. Scale on the valve
5. A failed or missing expansion tank