Potterton Boiler troubleshooting

7 different tables below are an excellent manual for owners of boiler of Potterton brand. Each of them describes the possible problems of a particular model of boiler of this brand. Problems of some models can be identified with the help of an error code and can be fixed with the help of information from the tables. In other models, the problem can be identified by visual inspection of the boiler. Before call the service, conduct an independent examination and draw a parallel between identified problem ant the same one in the manual. Perhaps one of these tables will save your time and money.

Potterton Diplomat HE Boiler Troubleshooting

ProblemCause
Pilot will not light1. Air in gas line.
2. Faulty gas control valve.
3. No spark at electrode tip.
4. Blocked pilot injector.
Pilot does not remain alight when knob released.1. Over heat cut off device tripped.
2. Loose connection on leads to overheat cut off device.
3. Loose thermocouple connection.
4. Faulty thermocouple.
5. Faulty over heat cut off device.
6. Faulty gas control valve.
7. Pilot partially blocked or needs adjusting.
ยป1. No electrical supply to burner.
Pilot established - main burner does not light.2. On/off switch is in 'OFF' position.
3. Boiler thermostat set too low.
4. Faulty thermostat or connections.
5. Faulty gas control valve.
Main burner remains alight when thermostat satisfied.1. Faulty thermostat.
2. Faulty gas control valve.
Main burner remains alight when on/off switch in 'OFF' position.1. Faulty on/off switch.
2. Faulty main gas valve.
3. Incorrect control circuit.

Potterton Eurocondense Plus Boiler Troubleshooting

Display flashing (Code-No.)DescriptionExplanations (Possible causes and function sequence)
10Outdoor temperature sensor short circuit or discontinuityCheck connection and outdoor temperature sensor
20Boiler flow sensor short circuit or open circuitCheck connection
40Boiler return sensor short circuit or open circuit
50Hot-water sensor 1 short circuit or open circuit
52Hot-water sensor 2 short circuit or open circuit
61Fault, room control module RRGCheck room control module RRG
62Wrong room control module connectedConnect compatible room control module
81Short circuit on LPB bus or no bus feedCheck bus
82Address conflict on LPB bus (EUROCONTROL)Check addresses of connected control modules
91EEPROM data lossInternal BMU error, process sensor, change BMU
92Hardware error
100Two time masterCheck EUROCONTROL timer master
110Limit stat trippedAllow unit to cool down and reset. If fault occurs several times, notify heating engineer temperature stat open circuit
111Max. temperature trippedNot heat requirement, pump defective, radiator valves closed
119Water pressure switch trippedCheck water pressure and add water if required
132Safety switch offe.g. contact F7 or F5 open
133No flame detected (no flame message after expiration of safety time)Reset, if fault occurs a number of time, notify heating engineer, insufficient gas , check polarity of line power connection, ignition electrodes and ionization current
134Flame failure during operationAutomatic restart attempt by PARAMOUNT
135Incorrect air supplyFan speed above or below speed threshold
140Impermissible LPB segment number or equipment numberCheck setting on EUROCONTROL
148Incompatibility between LPB interface/basic unit
151Internal error in BMUCheck parameters
152Error in BMU parameter settingsRepeat parameter settings
153EUROCONDENSE EC PLUS disabledPress reset button
154Temperature faultParameter incorrectly set
160Fan speed errorFan speed not reached
161Max. speed exceededMax. fan speed exceeded

Potterton Potterton 15 Boiler Troubleshooting

ProblemPossible causesSolution
The radiators are cold.The temperature set point for the heating is too low.Increase the value with the CH temperature knob or if a room thermostat is connected, increase the temperature on the room thermostat.
The heating mode is deactivated.Activate the heating mode.
The radiator valves are not open.Open the valves of all radiators connected to the system.
The boiler is not working.Check that the boiler is being supplied with power. Check fuses and switches.
Check whether the gas isolation cock is properly open.
If the property has a prepayment meter ensure it has sufficient credit.
The water pressure is too low (< 0.5 bar).Re-pressurise the system.
The boiler is not working.The temperature set point for the heating is too low.Increase the value with the CH temperature knob or if a room thermostat is connected, increase the temperature on the room thermostat.
No demand for heating.Ensure that timers & thermostats are calling for heat.
No power supply.Check that the boiler is being supplied with power. Check the fuses and switches.
The water pressure is too low (< 0.5 bar).Re-pressurise the system.
The boiler is indicating an error.Press the Reset button. Correct the error, if possible.
The gas pressure is too low.Check whether the gas isolation cock is fully open. Open the gas isolation cock.
Condensate drain blocked.Check drain, especially any external runs in freezing temperatures.

Potterton Assure combi 30 Boiler Troubleshooting

Eror codeDescription offautt
E09Gas valve connection cable
E15Gas valve fault
E20Central heating NTC fault
E28Flue NTC fault
E40Central heating return NTC fault
E109Pre-circulation fault
E110Safety thermostat operated
E118Primary system water pressure too low
E125Circulation fault (primary)
E128Flame failure
E130Flue NTC operated
E133Interruption of gas supply or flame failure
E135Interruption of gas supply (internal error)
E154Flow / return sensor temperature test
E160Fan or fan wiring fault
E270Circulation fault (Dry fire)
E321Hot water NTC fault
E384False flame

Potterton Derwent Prestige plus Boiler Troubleshooting

ProblemCause
Boiler does not attempt to light.a) Check electricity supply is available to boiler and on/off switch is illuminated. The boiler has an integral fuse.
Control Box does not lockout.b) Check the boiler is being called to operate. Thermostat calling lamp should be lit unless internal thermostat is satisfied or external control circuit is broken.
c) Check overheat cut off device has not operated.
d) Check power supply is available to control box (see wiring diagram). Replace box if faulty.
No Ignition Spark. Pilot does not Light. Control Box goes to lockouta) Check ignition electrode continuity for earth fault.
b) Check power supply is available to ignitor during ignition period.
c) Check operation of ignitor. Replace if necessary
Ignition sparks Pilot does not Light. Control Box goes to lockouta) Check gas supply is available at the pilot burner at the correct pressure.
b) Check gas supply is purged of air.
c) Check pilot injector
d) Check ignition electrode position.
Pilot Burner lights Control Box goes to lockout safety timea) Check electrical supply polarity
b) Check earth continuity to pilot burner
c) Check pilot burner pressure is correct
d) Check there is no earth leakage on ionisation probe circuit.
e) Check ionisation probe circuit for correct flame current. This is achieved by connecting a DC micrometer in series. A reading of at least 7^A DC should be obtained. If this is obtained and the control box continues to lock out then replace the control box.
Pilot Burner Lights. Main burner does not light Control Box does not lockouta) Check main burner gas cock is open.
b) Check electrical continuity to main gas valve
c) Check operation of gas valve and replace if necessary
d) Check control box. Replace if necessary
Pilot Burner Lights Main burner lights Control box locks out.a) Check ignition of main flame is smooth and reliable.
b) Check voltage supply for interference.
c) Faulty Control Box

Potterton Envoy 30 Boiler Troubleshooting

Error code ProblemCauseAction
1SensorFlow or return sensor out of calibrationSee chart
2Flow sensorFlow sensor is incorrectly fittedCheck sensor
3Case temperatureTemperature within boiler casing too highSee chart
4Dry fireBoiler has been fired without waterCheck system
5Flow sensorSensor failed open or closed circuitReplace sensor
6Return sensor
7Case sensor
8Dry fire sensor
9Fan speedFan speed incorrectSee chart
RShorted signalFlame signal shorted to groundCheck igniter etc
CFlame lossFlame loss after initial detectionSee chart
EControl failedControl has failedReplace control
PWiring faultLive on neutral connectionCorrect fault

Potterton Envoy Flowsure Boiler Troubleshooting

Error code Meaning Solution
LLast Lockout:This is when a lockout has occurred and the control has been reset, this event is then stored in the controls memory until another lockout occurs and is reset at which time the display is updated to reflect the new event.
The type of lockout is shown in the Flow Temperature & Settings Display.
For more information see the Fault Finding Chart.
BLast Blocking Error:This is when a blocking error has occurred and then cleared, this event is then stored in the memory until another blocking error occurs at which time the control updates the display to reflect the new event. The type of
Blocking Error is shown in the Flow Temperature and Settings Display.
For more information see the Fault Finding Chart.
GMaximum Fan Speed:This is normally set at 99 which is equivalent to 4680 RPM. this reading should not be changed as it affects the maximum heat output of the boiler.
JMinimum Fan Speed:This is normally set at 40 which is equivalent to 2920 RPM. this reading should not be changed as it affects the minimum heat input of the boiler and may cause noise below this figure.
FFan Speed Offset:This allows the fan speed to be adjusted in 3 x 60 RPM increments above and below the nominal speed of 4680 RPM - Setting 03 on the Flow
Temperature & Settings Display. This has been factory set to ensure that the correct air signal pressure is produced and may have been set anywhere between oo and 06. Adjustment in the range is achieved by pressing the + or - buttons whilst the F is displayed in the Status/Function Display.
UControl Status:From the information below it is possible to determine the function the control is performing at any one time. This is useful when diagnosing faults, as failure to carry out a step may point to a malfunctioning component.