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

Problem Cause
Pilot will not light 1. 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.
» 1. 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.) Description Explanations (Possible causes and function sequence)
10 Outdoor temperature sensor short circuit or discontinuity Check connection and outdoor temperature sensor
20 Boiler flow sensor short circuit or open circuit Check connection
40 Boiler return sensor short circuit or open circuit
50 Hot-water sensor 1 short circuit or open circuit
52 Hot-water sensor 2 short circuit or open circuit
61 Fault, room control module RRG Check room control module RRG
62 Wrong room control module connected Connect compatible room control module
81 Short circuit on LPB bus or no bus feed Check bus
82 Address conflict on LPB bus (EUROCONTROL) Check addresses of connected control modules
91 EEPROM data loss Internal BMU error, process sensor, change BMU
92 Hardware error
100 Two time master Check EUROCONTROL timer master
110 Limit stat tripped Allow unit to cool down and reset. If fault occurs several times, notify heating engineer temperature stat open circuit
111 Max. temperature tripped Not heat requirement, pump defective, radiator valves closed
119 Water pressure switch tripped Check water pressure and add water if required
132 Safety switch off e.g. contact F7 or F5 open
133 No 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
134 Flame failure during operation Automatic restart attempt by PARAMOUNT
135 Incorrect air supply Fan speed above or below speed threshold
140 Impermissible LPB segment number or equipment number Check setting on EUROCONTROL
148 Incompatibility between LPB interface/basic unit
151 Internal error in BMU Check parameters
152 Error in BMU parameter settings Repeat parameter settings
153 EUROCONDENSE EC PLUS disabled Press reset button
154 Temperature fault Parameter incorrectly set
160 Fan speed error Fan speed not reached
161 Max. speed exceeded Max. fan speed exceeded

 

Potterton Potterton 15 Boiler Troubleshooting

Problem Possible causes Solution
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 code Description offautt
E09 Gas valve connection cable
E15 Gas valve fault
E20 Central heating NTC fault
E28 Flue NTC fault
E40 Central heating return NTC fault
E109 Pre-circulation fault
E110 Safety thermostat operated
E118 Primary system water pressure too low
E125 Circulation fault (primary)
E128 Flame failure
E130 Flue NTC operated
E133 Interruption of gas supply or flame failure
E135 Interruption of gas supply (internal error)
E154 Flow / return sensor temperature test
E160 Fan or fan wiring fault
E270 Circulation fault (Dry fire)
E321 Hot water NTC fault
E384 False flame

Potterton Derwent Prestige plus Boiler Troubleshooting

Problem Cause
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 lockout a) 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 lockout a) 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 time a) 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 lockout a) 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 Problem Cause Action
1 Sensor Flow or return sensor out of calibration See chart
2 Flow sensor Flow sensor is incorrectly fitted Check sensor
3 Case temperature Temperature within boiler casing too high See chart
4 Dry fire Boiler has been fired without water Check system
5 Flow sensor Sensor failed open or closed circuit Replace sensor
6 Return sensor
7 Case sensor
8 Dry fire sensor
9 Fan speed Fan speed incorrect See chart
R Shorted signal Flame signal shorted to ground Check igniter etc
C Flame loss Flame loss after initial detection See chart
E Control failed Control has failed Replace control
P Wiring fault Live on neutral connection Correct fault

Potterton Envoy Flowsure Boiler Troubleshooting

Error code Meaning Solution
L Last 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.
B Last 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.
G Maximum 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.
J Minimum 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.
F Fan 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.
U Control 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.